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myd·ri·at·ic .mid-rē-'at-ik adj causing or involving dilation of the pupil of the eye
mydriatic n a drug that produces dilation of the pupil of the eye
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n.
a drug that causes the pupil of the eye to dilate. Examples are atropine, cyclopentolate, and phenylephrine. Mydriatics are used to aid examination of the eye and to treat some eye inflammations such as iritis and cyclitis.
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myd·ri·at·ic (mid″re-atґik) 1. dilating the pupil. 2. any drug that dilates the pupil.Medical dictionary. 2011.