mydriasis

[ mi-drahy-uh-sis, mahy- ]

/ mɪˈdraɪ ə sɪs, maɪ- /

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noun Medicine/Medical.

excessive dilatation of the pupil of the eye, as the result of disease, drugs, or the like.

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Compare miosis.

Origin of mydriasis

1650–60; <Latin mydriāsis<Greek mydríāsis

Words nearby mydriasis

mycotoxin, mycotrophic, mycotrophy, My country, 'tis of thee, mycovirus, mydriasis, mydriatic, myel-, myelencephalon, myelin, myelinated

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use mydriasis in a sentence

Visual acuteness on both sides 5/12, the left slightly better than the right; emmetropia in mydriasis by atropine.
Schweigger on Squint|C. Schweigger
Mydriasis does not always occur, and when it does, is much less than with cocaine.
Merck's 1899 Manual|Merck & Co.
During the seizure, the pupil does not react (this cannot be simulated) or there is excessive mydriasis.
Criminal Man|Gina Lombroso-Ferrero
At the same time there is a certain amount of mydriasis, but this is less pronounced than that produced by atropine.
Coca and its Therapeutic Application, Third Edition|Angelo Mariani

Mydriasis, mi-drī′a-sis, n. morbid dilatation of the pupil of the eye.
Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)|Various

British Dictionary definitions for mydriasis

mydriasis

/ (mɪˈdraɪəsɪs, maɪ-) /

noun

abnormal dilation of the pupil of the eye, produced by drugs, coma, etc

Word Origin for mydriasis

C17: via Late Latin from Greek; origin obscure

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