FORMIC ACID Meaning of FORMIC ACID in English [ 'fɔ:mɪk ]■ noun Chemistry an irritant volatile organic acid present in the fluid emitted by some ants; methanoic acid. [HCOOH.]OriginC18: formic from L. formica 'ant'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004