noun
hydroxy acid
Technical term in chemistry for an organic acid containing a hydroxyl group.
ヒドロキシ酸は化粧品にも使われることがある。
Hydroxy acids are sometimes used in cosmetics as well.
カルボン酸 (carboxylic acid) is a broader class; ヒドロキシ酸 is a carboxylic acid with an additional hydroxyl group.
From English 'hydroxy' + 酸 (acid).