tretinoin

[truh-tin-oh-in]

tre·tin·o·in

[truh-tin-oh-in]
noun
a drug chemically related to vitamin A, used as a topical ointment to treat skin disorders, especially acne.

Origin:
1960–65; t(ri-) + retino- (< Greek rhētī́nē resin) + -in1
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tretinoin is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Medical Dictionary

tretinoin tret·i·noin (trět'n-oin')
n.
An isomer of retinoic acid, used in the treatment of acne.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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