Retinoin

Part of speech: noun

Definitions

1. A medication derived from vitamin A used topically to treat acne and promote skin renewal by decreasing inflammation and encouraging cell turnover; it is also utilized to reduce the appearance of wrinkles and other signs of aging
2. A topical treatment sourced from vitamin A that aids in managing acne by reducing clogged pores and inflammation while enhancing skin texture and mitigating aging effects
3. A dermatological agent based on a vitamin A derivative that helps clear acne and revitalize skin by accelerating the shedding of old cells and stimulating new growth, thereby improving skin tone and reducing fine lines

Etymology: Retinoin is a chemical name built on "retinol," which itself was named for the retina, the light-sensitive layer at the back of the eye. Vitamin A was linked to night vision long before its chemistry was worked out, and in the 1930s researchers isolated the compound from the eye's photoreceptor pigment and named it "retinol." The "-in" ending is a conventional suffix in chemistry, used to name a substance, so retinoin is a derivative of that same root. The "retinoic acid" family followed from this. Retinoin is a name for tretinoin, the form of vitamin A acid that the body makes from retinol and that acts on gene expression rather than on vision directly. That shift from a visual pigment to a regulator of skin and cell growth explains why a name built around the eye ended up on a dermatology drug.

Synonyms: tretinoin, all-trans retinoic acid