noun
carboxylic acid
Technical term in organic chemistry for a compound containing a carboxyl group (-COOH).
酢酸は代表的なカルボキシル酸です。
Acetic acid is a typical carboxylic acid.
カルボキシル基 is the carboxyl functional group (-COOH), while カルボキシル酸 is the whole acid compound.
From English 'carboxyl' + 酸 (acid).