Noun
adapalene (uncountable)
(pharmacology) A retinoid C28H28O3 applied topically to the skin in the treatment of acne vulgaris. It is marketed under the trademark Differin and when used in combination with benzoyl peroxide, under the trademark Epiduo.
Types if topical retinoids include Adapalene, Tazarotene, and Tretinoin. Source: Internet