- excessive dilatation of the pupil of the eye, as the result of disease, drugs, or the like.
Origin of mydriasis
1650–60; < Latin mydriāsis < Greek mydríāsis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mydriasis
Mydriasis does not always occur, and when it does, is much less than with cocaine.Merck's 1899 Manual
Merck & Co.
Visual acuteness on both sides 5/12, the left slightly better than the right; emmetropia in mydriasis by atropine.Schweigger on Squint
Mydriasis, mi-drī′a-sis, n. morbid dilatation of the pupil of the eye.
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
- abnormal dilation of the pupil of the eye, produced by drugs, coma, etc
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
- Prolonged abnormal dilation of the pupil of the eye induced by a drug or caused by disease.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.