mydriasis

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my·dri·a·sis

 (mĭ-drī′ə-sĭs)
n.
Dilation of the pupil of the eye, especially when excessive or prolonged, usually as a result of trauma, a medical disorder, or a drug.

[Latin mydriāsis, from Greek mudriāsis, perhaps from mudros, red-hot mass of metal in a forge (in reference to the more brilliant appearance of the dilated pupil to ancient physicians, as a result of light reflected off the fundus of the eye ); possibly akin to mudān, to be damp, dripping ( mudros perhaps originally referring to molten iron).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

mydriasis

(mɪˈdraɪəsɪs; maɪ-)
n
(Pathology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

my•dri•a•sis

(mɪˈdraɪ ə sɪs, maɪ-)

n.
excessive dilatation of the pupil of the eye, as the result of disease, drugs, or the like. Compare miosis.
[1650–60; < Latin mydriāsis < Greek mydríāsis, appar. derivative of mýdros hot mass of iron, though sense connection unclear]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

mydriasis

abnormal dilatation of the pupil, the result of disease or the use of certain drugs. Cf. miosis. — mydriatic, adj.
See also: Eyes
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mydriasis - reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
dilatation, dilation - the act of expanding an aperture; "the dilation of the pupil of the eye"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

my·dri·a·sis

n. midriasis, dilatación prolongada de la pupila.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
What it does: Yohimbine has been approved by the Food and Drug Administration for dilating the pupils of the eyes.