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

noun Medicine/Medical.

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

Compare miosis.

Origin of mydriasis

1650–60; < Latin mydriāsis < Greek mydríāsis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mydriasis

Historical Examples of mydriasis

British Dictionary definitions for mydriasis



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

mydriasis in Medicine




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.