tretinoin

tretinoin [truh-tin-oh-in] Word Origin noun

1. a drug chemically related to vitamin A, used as a topical ointment to treat skin disorders, especially acne.

Origin of tretinoin 1960–65; t(ri-) + retino- (Greek rhētī́nē resin) + -in1 tretinoin in Medicine tretinoin [trĕt′n-oin′] n.

1. An isomer of retinoic acid, used in the treatment of acne.