ret·i·no·ic acid (r t n-   k)n. In both senses also called tretinoin, vitamin A acid. 1. A vitamin A derivative, C20H28O2, that is a regulator substance in morphogenesis and functions in the growth and development of bone and the maintenance of epithelium. 2. A preparation of this, used topically to treat acne and to modify the appearance of fine wrinkles, hyperpigmentation, and roughness of facial skin. |
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