mydriasis

my·dri·a·sis  (m-dr-ss)

n.

Prolonged abnormal dilatation of the pupil of the eye caused by disease or a drug.

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[Latin, from Greek mudrisis.]

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mydriasis

abnormal dilatation of the pupil, the result of disease or the use of certain drugs. Cf. miosis. — mydriatic, adj.

See also: Eyes

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 dilatation, dilation - the act of expanding an aperture; "the dilation of the pupil of the eye" inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex - an automatic instinctive unlearned reaction to a stimulus