mydriasis is a topic covered in the Taber's Medical Dictionary.

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(mĭ-drī′ă-sĭs )

[L., Gr. mydriasis, of uncertain origin]
Dilation of the pupil.

Causes include fright and other causes of sympathetic nervous system activation, first and third stages of anesthesia, drugs, coma, botulism, and irritation of the cervical sympathetic nerve.

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