Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Dilation of the pupil of the eye, especially when excessive or prolonged, usually as a result of trauma, a medical disorder, or a drug.

from The Century Dictionary.

  • noun In medicine, a morbid dilatation of the pupil of the eye.
  • noun Hydrophthalmia.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol. & Med.) A long-continued or excessive dilatation of the pupil of the eye.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun medicine The condition of having abnormally large and dilated pupils due to disease or drugs, particularly stimulants such as (meth)amphetamines, cocaine, etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[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).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin mydriasis, from Ancient Greek μυδρίασις (mydriāsis, "undue enlargement of the pupil"), from μύδρος (mydros, "mass of red hot material in a forge"), possibly because the pupil is particularly bright or sparkling when dilated.

Examples

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