moþþe

Old English moþþe comes from a Germanic root meaning 'gnawer' or 'maggot.' The word is cognate with Old Norse motti and Middle Dutch motte. In all these languages, the primary meaning was not the winged insect fluttering around a candle but the larva chewing holes in woolen garments. A moth was a pest before it was a creature with wings. The Bible's 'moth and rust' — where moth destroys stored treasure — refers to the larva, not the adult.

The shift from larva to adult insect happened gradually in English between the fourteenth and sixteenth centuries. As natural history became more systematic, the word moth expanded to cover the entire life cycle: egg, larva, pupa, adult. By Shakespeare's time, a moth was the winged thing drawn to flame. 'As the moth to the candle' was already proverbial. The destructive larva and the flame-seeking adult became a single word covering two very different behaviors.

Lepidoptera — the scientific order containing both moths and butterflies — was coined by Linnaeus in 1735 from Greek lepis (scale) and pteron (wing). The distinction between moth and butterfly is not taxonomic but cultural. Moths are nocturnal, dull-colored, and associated with decay. Butterflies are diurnal, bright, and associated with beauty. The biological difference is minor. The linguistic and symbolic difference is enormous.

The moth's reputation has never recovered from its larval origins. It remains the butterfly's dark twin: the night version, the destructive version, the one drawn to the wrong kind of light. The word still carries the Old English sense of something that consumes what you value.