moth UK /mɒθ/US /mɔθ/noun 4verb 1/moʊt/ noun 1forms 3 noun4 •Any flying insect of the order Lepidoptera not in the superfamily Papilionoidea, most species of which are nocturnal and can be distinguished from butterflies by feather-like antennae. •(figurative) Anything that gradually and silently eats, consumes, or wastes any other thing. •(Ireland, slang) A girlfriend. •(old-fashioned) A liver spot, especially an irregular or feathery one.To remove moth patches, wash the spots with a solution of common bicarbonate of soda and water several times a day, until the patches are removed, which will usually be in forty-eight hours. — 1895 verb1 •To hunt for moths. moth UK /məʊt/US /moʊt/ noun1 •A moth bean plant (Vigna aconitifolia). formsmothed · mothing · moths