Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
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).]
(Pathology) abnormal dilation of the pupil of the eye, produced by drugs, coma, etc
[C17: via Late Latin from Greek; origin obscure]
my•dri•a•sis(mɪˈdraɪ ə sɪs, maɪ-)
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]
abnormal dilatation of the pupil, the result of disease or the use of certain drugs. Cf. miosis. — mydriatic, adj.See also: Eyes
Switch to new thesaurus
|Noun||1.||mydriasis - reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs|
n. midriasis, dilatación prolongada de la pupila.