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Definition of butterfly
noun (plural butterflies)
- 1a nectar-feeding insect with two pairs of large, typically brightly coloured wings that are covered with microscopic scales. Butterflies are distinguished from moths by having clubbed or dilated antennae, holding their wings erect when at rest, and being active by day.
- Superfamilies Papilionoidea and Hesperioidea, order Lepidoptera: several families. Formerly placed in a grouping known as the Rhopalocera