Mydriasis

[mi'draiәsis]

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

Typed by Katie--From WordNet

(n.) A long-continued or excessive dilatation of the pupil of the eye.

Editor: Upton

n. morbid dilatation of the pupil of the eye.—adj. Mydriat′ic.—n. a drug causing this.

Checked by Elisha