noun, plural mioses [mahy-oh-seez] . Medicine/Medical.
excessive constriction of the pupil of the eye, as a result of drugs, disease, or the like.
Also, myosis.
Compare mydriasis.

1810–20; variant of myosis < Greek (ein) to shut (the eyes) + -ōsis -osis

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World English Dictionary
miosis or myosis (maɪˈəʊsɪs)
n , pl -ses
1.  excessive contraction of the pupil of the eye, as in response to drugs
2.  a variant spelling of meiosis
[C20: from Greek muein to shut the eyes + -osis]
myosis or myosis (maɪˈəʊsɪs, -siːz)
[C20: from Greek muein to shut the eyes + -osis]
miotic or myosis
adj, —n
myotic or myosis
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1819, from Gk. myein "to shut (the eyes)" + -osis.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

miosis mi·o·sis or my·o·sis (mī-ō'sĭs)
n. pl. mi·o··ses (-sēz)

  1. The period of decline of a disease in which the intensity of the symptoms begins to diminish.

  2. Constriction of the pupil of the eye, resulting from a normal response to an increase in light or caused by certain drugs or pathological conditions.

The American Heritage® Stedman's Medical Dictionary
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