We don't have synonyms for tretinoin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are retinoid and cretinoid.
(n) :
(organic chemistry, pharmacology) The all-trans isomer of retinoic acid that is applied to the skin to treat severe acne and reduce facial wrinkles, roughness, and pigmented spots.
(n) :
(organic chemistry, pharmacology) The all-trans isomer of retinoic acid that is applied to the skin to treat severe acne and reduce facial wrinkles, roughness, and pigmented spots.