noun, plural mi·o·ses [mahy-oh-seez] /maɪˈoʊ siz/. Medicine/Medical.
excessive constriction of the pupil of the eye, as a result of drugs, disease, or the like.
Origin of miosis
variant of myosis
< Greek mý(ein
) to shut (the eyes) + -ōsis -osis
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for myosis
Historical Examples of myosis
An example of this kind of myosis is the action of muscarine.
Myosis produced by means of solutions of various drugs, a myosis followed by reduction of intra-ocular tension.
Examination showed slight atrophy of both optic nerves, Argyll-Robertson pupil, and myosis.
British Dictionary definitions for myosis
noun plural -ses (-siːz)
Derived Formsmiotic or myotic (maɪˈɒtɪk), adjective, noun
excessive contraction of the pupil of the eye, as in response to drugs
Word Origin for miosis
C20: from Greek muein to shut the eyes + -osis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for myosis
1819, from Greek myein "to shut (the eyes)" + -osis. Greek myein is perhaps originally "to close the lips," from PIE *meue- "to be silent" (see mute (adj.)). Related: Miotic.
Online Etymology Dictionary, © 2010 Douglas Harper
n. pl. mi•o••ses (-sēz)
The period of decline of a disease in which the intensity of the symptoms begins to diminish.
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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.