[ mahy-oh-sis ]
/ maɪˈoʊ sɪs /
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.
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Origin of miosis
1810–20; variant of myosis < Greek mý(ein) to shut (the eyes) + -ōsis -osis
Words nearby miosis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for miosis
/ (maɪˈəʊsɪs) /
noun plural -ses (-siːz)
excessive contraction of the pupil of the eye, as in response to drugs
a variant spelling of meiosis (def. 1)
Derived forms of miosismiotic or myotic (maɪˈɒtɪk), adjective, noun
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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for miosis
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.