CARBOXYL Meaning of CARBOXYL in English [ kα:'bɒksʌɪl , -sɪl ]■ noun [as modifier ] Chemistry of or denoting the radical ‒COOH, present in organic acids.OriginC19: from carbo- + ox- + -yl . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004