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Tearing, lacrimation, or lachrymation is the secretion of tears, which often serves to clean and lubricate the eyes in response to an irritation of the eyes. [1]

94 relations: Acetylcholine, Adrenocorticotropic hormone, Anger, Antibody, Anticholinergic, Artificial tears, Autonomic nervous system, Awe, Bacteria, Bell's palsy, Cocaine, Contact lens, Cornea, Crocodile tears, Crying, Dacryocystocele, Dry eye syndrome, Dust, Emotion, Encyclopædia Britannica, Enkephalin, Epiphora (medicine), Eye, Eye drop, Eyelid, Facial nerve, Familial dysautonomia, Fear, Frustration, Glucose, Goblet cell, Grief, Happiness, Humour, Hydrophobe, Immune system, Infection, Lacrimal canaliculi, Lacrimal gland, Lacrimal lake, Lacrimal punctum, Lacrimal sac, Lacritin, Lactoferrin, Laughter, Leu-enkephalin, Limbic system, Lipid, Lipocalin, Love, ..., Lysozyme, Mammal, Meibomian gland, Mourning, Mucin, Muscarinic acetylcholine receptor, Nasal cavity, Nasolacrimal canal, Nasolacrimal duct, Nicotinic acetylcholine receptor, Onion, Ophthalmic nerve, Oxygen, Pain, Parasympathetic nervous system, Pepper spray, Perfume, Pleasure, Potassium, Professional mourning, Prolactin, Psychotherapy, Re-evaluation Counseling, Reader's Digest, Rehovot, Remorse, Sadness, Salt, Secretion, Sodium, Sorrow (emotion), Stress (biology), Suffering, Superior salivatory nucleus, Tarsus (eyelids), Tear gas, Tears, The Age, Transient receptor potential channel, Trigeminal nerve, Urea, Water, Weizmann Institute of Science, Yawn. Expand index (44 more) »


Acetylcholine (ACh) is an organic chemical that functions in the brain and body of many types of animals, including humans, as a neurotransmitter—a chemical message released by nerve cells to send signals to other cells.

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Adrenocorticotropic hormone

Adrenocorticotropic hormone (ACTH, also adrenocorticotropin, corticotropin) is a polypeptide tropic hormone produced by and secreted by the anterior pituitary gland.

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Anger or wrath is an intense negative emotion.

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An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein produced mainly by plasma cells that is used by the immune system to neutralize pathogens such as pathogenic bacteria and viruses.

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An anticholinergic agent is a substance that blocks the neurotransmitter acetylcholine in the central and the peripheral nervous system.

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Artificial tears

Artificial tears are lubricant eye drops used to treat the dryness and irritation associated with deficient tear production in keratoconjunctivitis sicca (dry eyes).

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Autonomic nervous system

The autonomic nervous system (ANS), formerly the vegetative nervous system, is a division of the peripheral nervous system that supplies smooth muscle and glands, and thus influences the function of internal organs.

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Awe is an emotion comparable to wonder but less joyous.

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Bacteria (common noun bacteria, singular bacterium) is a type of biological cell.

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Bell's palsy

Bell's palsy is a type of facial paralysis that results in an inability to control the facial muscles on the affected side.

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Cocaine, also known as coke, is a strong stimulant mostly used as a recreational drug.

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Contact lens

A contact lens, or simply contact, is a thin lens placed directly on the surface of the eye.

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The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

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Crocodile tears

Crocodile tears (or superficial sympathy) is a false, insincere display of emotion such as a hypocrite crying fake tears of grief.

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Crying is the shedding of tears (or welling of tears in the eyes) in response to an emotional state, pain or a physical irritation of the eye.

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Dacryocystocele or timo cyst is a benign, bluish-gray mass in the inferomedial canthus that forms as a result of a narrowing or obstruction of the nasolacrimal duct, usually during prenatal development.

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Dry eye syndrome

Dry eye syndrome (DES), also known as keratoconjunctivitis sicca (KCS), is the condition of having dry eyes.

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Dust are fine particles of matter.

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Emotion is any conscious experience characterized by intense mental activity and a certain degree of pleasure or displeasure.

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Encyclopædia Britannica

The Encyclopædia Britannica (Latin for "British Encyclopaedia"), published by Encyclopædia Britannica, Inc., is a general knowledge English-language encyclopaedia.

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An enkephalin (occasionally spelled encephalin) is a pentapeptide involved in regulating nociception in the body.

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Epiphora (medicine)

Epiphora is an overflow of tears onto the face.

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Eyes are organs of the visual system.

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Eye drop

Eye drops are saline-containing drops used as an ocular route to administer.

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An eyelid is a thin fold of skin that covers and protects the human eye.

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Facial nerve

The facial nerve is the seventh cranial nerve, or simply cranial nerve VII.

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Familial dysautonomia

Familial dysautonomia (FD), sometimes called Riley–Day syndrome and hereditary sensory and autonomic neuropathy type III (HSAN-III), is a disorder of the autonomic nervous system which affects the development and survival of sensory, sympathetic and some parasympathetic neurons in the autonomic and sensory nervous system resulting in variable symptoms, including insensitivity to pain, inability to produce tears, poor growth, and labile blood pressure (episodic hypertension and postural hypotension).

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Fear is a feeling induced by perceived danger or threat that occurs in certain types of organisms, which causes a change in metabolic and organ functions and ultimately a change in behavior, such as fleeing, hiding, or freezing from perceived traumatic events.

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In psychology, frustration is a common emotional response to opposition, related to anger, annoyance and disappointment, frustration arises from the perceived resistance to the fulfillment of an individual's will or goal and is likely to increase when a will or goal is denied or blocked.

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Glucose is a simple sugar with the molecular formula C6H12O6.

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Goblet cell

Goblet cells are simple columnar epithelial cells that secrete gel-forming mucins, like mucin MUC5AC.

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Grief is a multifaceted response to loss, particularly to the loss of someone or something that has died, to which a bond or affection was formed.

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In psychology, happiness is a mental or emotional state of well-being which can be defined by positive or pleasant emotions ranging from contentment to intense joy.

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Humour (British English) or humor (American English; see spelling differences) is the tendency of experiences to provoke laughter and provide amusement.

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In chemistry, hydrophobicity is the physical property of a molecule (known as a hydrophobe) that is seemingly repelled from a mass of water.

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Immune system

The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease.

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Infection is the invasion of an organism's body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to the infectious agents and the toxins they produce.

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Lacrimal canaliculi

The lacrimal canaliculi, (sing. canaliculus), also known as the lacrimal canals or lacrimal ducts, are the small channels in each eyelid that commence at minute orifices, termed puncta lacrimalia, on the summits of the papillae lacrimales, seen on the margins of the lids at the lateral extremity of the lacus lacrimalis.

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Lacrimal gland

The lacrimal glands are paired, almond-shaped exocrine glands, one for each eye, that secrete the aqueous layer of the tear film.

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Lacrimal lake

The lacrimal lake is the pool of tears in the lower conjunctival cul-de-sac, which drains into the opening of the tear drainage system (the puncta lacrimalia).

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Lacrimal punctum

The lacrimal punctum (plural puncta) or lacrimal point, is a minute opening on the summits of the lacrimal papillae, seen on the margins of the eyelids at the lateral extremity of the lacrimal lake.

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Lacrimal sac

The lacrimal sac or lachrymal sac is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla.

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Lacritin is a 12.3 kDa glycoprotein encoded in humans by the LACRT gene.

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Lactoferrin (LF), also known as lactotransferrin (LTF), is a multifunctional protein of the transferrin family.

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Laughter is a physical reaction in humans consisting typically of rhythmical, often audible contractions of the diaphragm and other parts of the respiratory system.

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Leu-enkephalin is an endogenous opioid peptide neurotransmitter with the amino acid sequence Tyr-Gly-Gly-Phe-Leu that is found naturally in the brains of many animals, including humans.

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Limbic system

The limbic system is a set of brain structures located on both sides of the thalamus, immediately beneath the cerebrum.

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In biology and biochemistry, a lipid is a biomolecule that is soluble in nonpolar solvents.

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The lipocalins are a family of proteins which transport small hydrophobic molecules such as steroids, bilins, retinoids, and lipids.

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Love encompasses a variety of different emotional and mental states, typically strongly and positively experienced, ranging from the most sublime virtue or good habit, the deepest interpersonal affection and to the simplest pleasure.

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Lysozyme, also known as muramidase or N-acetylmuramide glycanhydrolase is an antimicrobial enzyme produced by animals that forms part of the innate immune system.

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Mammals are the vertebrates within the class Mammalia (from Latin mamma "breast"), a clade of endothermic amniotes distinguished from reptiles (including birds) by the possession of a neocortex (a region of the brain), hair, three middle ear bones, and mammary glands.

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Meibomian gland

The Meibomian glands (often written with a small m, and also called tarsal glands) are a holocrine type of exocrine glands, at the rim of the eyelids inside the tarsal plate, responsible for the supply of meibum, an oily substance that prevents evaporation of the eye's tear film.

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Mourning is, in the simplest sense, grief over someone's death.

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Mucins are a family of high molecular weight, heavily glycosylated proteins (glycoconjugates) produced by epithelial tissues in most animals.

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Muscarinic acetylcholine receptor

Muscarinic acetylcholine receptors, or mAChRs, are acetylcholine receptors that form G protein-coupled receptor complexes in the cell membranes of certain neurons and other cells.

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Nasal cavity

The nasal cavity (nasal fossa, or nasal passage) is a large air filled space above and behind the nose in the middle of the face.

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Nasolacrimal canal

The canal containing the nasolacrimal duct is called the nasolacrimal canal.

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Nasolacrimal duct

The nasolacrimal duct (sometimes called the tear duct) carries tears from the lacrimal sac of the eye into the nasal cavity.

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Nicotinic acetylcholine receptor

Nicotinic acetylcholine receptors, or nAChRs, are receptor proteins that respond to the neurotransmitter acetylcholine.

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The onion (Allium cepa L., from Latin cepa "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium.

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Ophthalmic nerve

The ophthalmic nerve (first division of fifth cranial nerve, ophthalmic division of trigeminal nerve, first division of trigeminal nerve, CN V1, latin: nervus ophthalmicus) is the first branch of the trigeminal nerve.

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Oxygen is a chemical element with symbol O and atomic number 8.

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Pain is a distressing feeling often caused by intense or damaging stimuli.

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Parasympathetic nervous system

The parasympathetic nervous system (PSNS) is one of the two divisions of the autonomic nervous system (a division of the peripheral nervous system (PNS)), the other being the sympathetic nervous system.

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Pepper spray

Pepper spray (also known as capsicum spray) is a lachrymatory agent (a chemical compound that irritates the eyes to cause tears, pain, and temporary blindness) used in policing, riot control, crowd control, and self-defense, including defense against dogs and bears.

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Perfume (parfum) is a mixture of fragrant essential oils or aroma compounds, fixatives and solvents, used to give the human body, animals, food, objects, and living-spaces an agreeable scent.

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Pleasure is a broad class of mental states that humans and other animals experience as positive, enjoyable, or worth seeking.

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Potassium is a chemical element with symbol K (from Neo-Latin kalium) and atomic number 19.

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Professional mourning

Most of the people hired to perform the act of professional mourning were women.

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Prolactin (PRL), also known as luteotropic hormone or luteotropin, is a protein that is best known for its role in enabling mammals, usually females, to produce milk.

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Psychotherapy is the use of psychological methods, particularly when based on regular personal interaction, to help a person change behavior and overcome problems in desired ways.

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Re-evaluation Counseling

Re-evaluation Counseling (RC) is an organization directed by Re-evaluation Counseling Community Resources, Inc., that practices "co-counseling", a peer-based counseling procedure centered on helping people and of bringing about social reform.

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Reader's Digest

Reader's Digest is an American general-interest family magazine, published ten times a year.

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Rehovot (רְחוֹבוֹת) is a city in the Central District of Israel, about south of Tel Aviv.

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Remorse is a distressing emotion experienced by a person who regrets actions which they deem to be shameful, hurtful, or violent.

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Sadness is an emotional pain associated with, or characterized by, feelings of disadvantage, loss, despair, grief, helplessness, disappointment and sorrow.

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Salt, table salt or common salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in its natural form as a crystalline mineral is known as rock salt or halite.

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Secretion is the movement of material from one point to another, e.g. secreted chemical substance from a cell or gland.

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Sodium is a chemical element with symbol Na (from Latin natrium) and atomic number 11.

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Sorrow (emotion)

Sorrow is an emotion, feeling, or sentiment.

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Stress (biology)

Physiological or biological stress is an organism's response to a stressor such as an environmental condition.

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Suffering, or pain in a broad sense, may be an experience of unpleasantness and aversion associated with the perception of harm or threat of harm in an individual.

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Superior salivatory nucleus

The superior salivatory nucleus (or nucleus salivatorius superior) of the facial nerve is a visceromotor cranial nerve nucleus located in the pontine tegmentum.

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Tarsus (eyelids)

The tarsi (tarsal plates) are two comparatively thick, elongated plates of dense connective tissue, about in length; one is found in each eyelid, and contributes to its form and support.

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Tear gas

Tear gas, formally known as a lachrymator agent or lachrymator (from the Latin lacrima, meaning "tear"), sometimes colloquially known as mace,"Mace" is a brand name for a tear gas spray is a chemical weapon that causes severe eye and respiratory pain, skin irritation, bleeding, and even blindness.

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Tearing, lacrimation, or lachrymation is the secretion of tears, which often serves to clean and lubricate the eyes in response to an irritation of the eyes.

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The Age

The Age is a daily newspaper that has been published in Melbourne, Australia, since 1854.

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Transient receptor potential channel

Transient receptor potential channels (TRP channels) are a group of ion channels located mostly on the plasma membrane of numerous animal cell types.

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Trigeminal nerve

The trigeminal nerve (the fifth cranial nerve, or simply CN V) is a nerve responsible for sensation in the face and motor functions such as biting and chewing; it is the largest of the cranial nerves.

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Urea, also known as carbamide, is an organic compound with chemical formula CO(NH2)2.

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Water is a transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.

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Weizmann Institute of Science

The Weizmann Institute of Science (מכון ויצמן למדע Machon Weizmann LeMada) is a public research university in Rehovot, Israel, established in 1934, 14 years before the State of Israel.

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A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath. Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. It is commonly associated with tiredness, stress, sleepiness, or even boredom and hunger. In humans, yawning is often triggered by others yawning (e.g. seeing a person yawning, talking to someone on the phone who is yawning) and is a typical example of positive feedback. This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles, and can occur across species. Approximately 20 psychological reasons for yawning have been proposed by scholars, but there is little agreement on the primacy of any one. During a yawn, the tensor tympani muscle in the middle ear contracts, creating a rumbling noise from within the head. Yawning is sometimes accompanied, both in humans and animals, by an instinctive act of stretching several parts of the body, including arms, neck, shoulders and back.

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Alacria, Basal tears, Bogorad's Syndrome, Bogorad's syndrome, Bogorad’s Syndrome, Epiphoria, Lachrymation, Lacrimal fluid, Lacrimation, Lacrymation, Leamy eye, Pre-corneal tear film, Reflex ears, Tear Duct and Gland, Tear film, Teary, Watering eyes, Watery eyes, Wept.


[1] https://en.wikipedia.org/wiki/Tears

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