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or myosis

[mahy-oh-sis] /maɪˈoʊ sɪs/
noun, plural mioses
[mahy-oh-seez] /maɪˈoʊ siz/ (Show IPA).
excessive constriction of the pupil of the eye, as a result of drugs, disease, or the like.
Compare mydriasis.
Origin of miosis
1810-20; variant of myosis < Greek mý(ein) to shut (the eyes) + -ōsis -osis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for miosis


noun (pl) -ses (-siːz)
excessive contraction of the pupil of the eye, as in response to drugs
a variant spelling of meiosis (sense 1)
Derived Forms
miotic, myotic (maɪˈɒtɪk) adjective, noun
Word Origin
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
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Word Origin and History for miosis

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
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miosis in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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