Retin-A definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a substance containing tretinoin, used especially in the treatment of acne
Retin-A definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A trademark for a preparation of retinoic acid, used in the topical treatment of acne.
retin-a - Medical Definition
A trademark for a preparation of retinoic acid.