Definition of mydriasis in English:

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Pronunciation: /ˌmɪdrɪˈeɪsɪs/
Pronunciation: /mɪˈdrʌɪəsɪs/


[mass noun] Medicine
Dilation of the pupil of the eye.
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.

For editors and proofreaders

Line breaks: my¦dria|sis

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