# tretinoin

> English word · Noun · IPA /tɹəˈtɪn.əʊ.ɪn/ · frequency rank #82,867

## Definitions
1. 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.

## Etymology
From tr(ans)- + retino(ic acid) + -in.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tretinoin