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[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.
Compare miosis.
Origin of mydriasis
1650-60; < Latin mydriāsis < Greek mydríāsis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for mydriasis


/mɪˈdraɪəsɪs; maɪ-/
abnormal dilation of the pupil of the eye, produced by drugs, coma, etc
Word Origin
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
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mydriasis in Medicine

mydriasis my·dri·a·sis (mĭ-drī'ə-sĭs)
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.
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