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May 18, 2013
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Definition of Iris

Iris: The circular, colored curtain of the eye. The opening of the iris forms the pupil. The iris helps regulate the amount of light that enters the eye.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4044
Last Editorial Review: 3/19/2012

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