myosis

n. abnormal contraction of the pupil of the eye, miosis (Medicine)

Miosis should not be confused with meiosis, the cellular division process involved in sexual reproduction, or mitosis, the cellular division of somatic body cells. Miosis is a medical term for constriction of the pupil. It is the opposite of mydriasis. It is seen in a variety of medical conditions, and can also be caused by certain drugs and chemicals. Eye drops used to intentionally cause miosis are known as "miotics". Extreme miosis is commonly called "pinpoint pupils", a situation that can be caused by use of opiates.
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My·o·sis n. Variant of miosis. myosis see miosis. miosis, myosis excessive contraction of the pupil. [more]Myosis - Community and Resources

Noun
1. an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest)
(synonym) epidemic pleurodynia, epidemic myalgia, diaphragmatic pleurisy, Bornholm disease
(hypernym) epidemic disease
2. reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
(synonym) light reflex, pupillary reflex, miosis
(hypernym) reflex, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction

n. myosis, abnormal contraction of the pupil of the eye, miosis (Medicine)