Scientific taxonomic term for the order of insects that includes butterflies and moths. In everyday contexts, チョウ目 or ガ目 may be used instead.
Lepidoptera is a taxonomic group of insects that includes butterflies and moths.
From 鱗 (りん, 'scale') + 翅 (し, 'wing') + 目 (もく, 'order'), referring to the scaly wings characteristic of this insect order.