mydriasis

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

/ mɪˈdraɪ ə sɪs, maɪ- /

noun Medicine/Medical.

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

Nearby words

mycotoxicosis, mycotoxin, mycotrophic, mycotrophy, mycovirus, mydriasis, mydriatic, myectomy, myectopy, myel-, myelapoplexy

Compare miosis.

Origin of mydriasis

1650–60; < Latin mydriāsis < Greek mydríāsis

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mydriasis

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
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
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.

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

Medicine definitions for mydriasis

mydriasis

[ mĭ-drī′ə-sĭs ]

n.

Prolonged abnormal dilation of the pupil of the eye induced by a drug or caused by disease.