Retinoid
Pronunciation: RET-ih-noyd
A class of vitamin A derivatives used topically or systemically to stimulate cell turnover, reduce fine lines, and treat acne and hyperpigmentation.
Full Definition
Retinoids encompass a broad family of compounds derived from vitamin A, including retinol, retinaldehyde, tretinoin, and adapalene. In cosmetic dermatology, they are prized for their ability to accelerate epidermal cell turnover, stimulate collagen synthesis, and reduce the appearance of fine lines, uneven tone, and acne lesions. Prescription-strength retinoids (e.g., tretinoin) are distinguished from over-the-counter retinol formulations; editors must preserve this distinction carefully. They are often referenced in product monographs, treatment protocols, and patient information leaflets and are subject to regulatory classification that varies by jurisdiction.
Usage
Usage note: Do not use 'retinoid' as a synonym for 'retinol' in patient-facing copy; retinol is one type of retinoid. Maintain the hierarchy: retinoid (class) > tretinoin/retinol/adapalene (members).
In Context
- "The protocol specified a nightly retinoid application for six weeks prior to the laser treatment session." — Treatment protocol document
- "Editors should not conflate retinoid with retinol, as the former is the class designation and the latter a specific compound." — Editorial style guide