[ rĕt′n-ō′ĭk ]
An acid formed in the oxidation of retinaldehyde and used as a topical treatment for acne.vitamin A acid
Y.E.S: These Words Are AcronymsMaybe you already knew RADAR actually stands for "radio detecting and ranging," but what about these other acronyms hiding in your everyday speech?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.