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1. Oxford Dictionary

   retinoic acid

   • IPA[rɛtɪˈnəʊɪk]

   英式

   • n.
     a carboxylic acid, obtained from retinol by oxidation and used in ointments to treat acne.

   • noun: retinoic acid

2. • 更多解釋

   retinoic acid

   • IPA[ˌretnˌōik ˈasid]

   美式

   • n.
     a carboxylic acid, obtained from retinol by oxidation and used in ointments to treat acne.

   Oxford American Dictionary