Retinoid

Part of speech: noun

Definitions

1. A category of chemical substances associated with vitamin A, commonly used for skin disorders and to promote skin health and appearance
2. A group of vitamin A analogs that play a significant role in skin treatment, including acne management and enhancing skin texture
3. A class of compounds related to vitamin A that are utilized in dermatology to treat various skin conditions and improve the overall quality of the skin

Etymology: The name "retinoid" describes a chemical family by its resemblance to a molecule, not by where it came from. Its root is the Ancient Greek "rhētínē," meaning "resin," the sticky substance that flows from pine and other trees. The "-oid" ending, from Greek "eidos," meaning "form" or "likeness," marks something that resembles the thing named before it. So a retinoid is a substance resembling retinol, the scientific name for vitamin A, and the link to resin comes in through that older word. The chain runs through "retinol," which itself was built from "retin-" and the chemical suffix "-ol." Vitamin A was named for its role in the retina of the eye, and the "retin" element carries that connection. Retinoid was then formed by adding "-oid" to this stem, so the word's history is a modern scientific coinage that ultimately draws on an ancient Greek word for a tree product. Ancient Greeks would not have recognised the compound, which was built in the twentieth century from classical roots.

Synonyms: vitamin A derivative, retinoic acid, retinal, retinol