MYDRIASIS - Definition

Pronunciation:		mi'drIusis
WordNet Dictionary

	Definition:	[n] reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs

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	See Also:	dilatation, dilation, inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, unconditioned reflex

Webster's 1913 Dictionary

	Definition:	\Mydri"asis\, n. [L., fr. Gr. ?.] (Physiol. & Med.) A long-continued or excessive dilatation of the pupil of the eye.

Medical Dictionary

	Definition:	dilation of the pupil.

Biology Dictionary

	Definition:	Mydriasis is the abnormal dilation of the pupils of the eye; it is a clinical sign associated with many conditions including hyperthyroidism.