mouldmouldmouldsmouldedmoulding2 (British) (Americanmold)verb (moulds, moulding, moulded)to make something soft into a certain shape: The children moulded animals out of clay.mouldmouldmoulds1 (British) (Americanmold)noun1(pluralmoulds) a container that you pour liquid into. The liquid then becomes hard (sets) and takes the shape of the container: They poured the chocolate into a heart-shaped mould.2 (no plural) a soft green, grey or blue substance that grows on food that is too old▶ mouldymouldymouldiermouldiestadjective: mouldy cheese