n.1 any usu. nocturnal insect of the order Lepidoptera excluding butterflies, having a stout body and without clubbed antennae.
2 any small lepidopterous insect of the family Tineidae breeding in cloth etc., on which its larva feeds.
Phrases and idioms:
moth-eaten
1. damaged or destroyed by moths.
2 antiquated, time-worn.
Etymology: OE moththe