Definition of mydriasis in English:


Syllabification: my·dri·a·sis
Pronunciation: /məˈdrīəsəs


  • Dilation of the pupil of the eye.
    More example sentences
    • Its strong alpha properties, especially at higher dosages, leads to mydriasis (ie, pupil dilation).
    • Long-term therapy is required, and the drugs have numerous side effects, including dry mouth, dry eyes, constipation, blurry vision, mydriasis, and difficulty with urination.
    • Often mydriasis occurs with the pupils poorly reactive or non-reactive to light.


early 19th century: via Latin from Greek mudriasis.

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a small amount; a little