tret·i·noin 
(trĕtĭ-noin′)
(trĕtĭ-noin′)n.
An isomer of retinoic acid used topically to treat acne and to mitigate fine facial wrinkling and orally to treat one form of leukemia.
[T(RANS-) + RETINO(IC ACID) + -IN.]
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