D defs.my
Entry 1 sense Webster, 1913

Butterfly

/bŭt'-ẽrf-līˌ/ · But·ter·fly · IPA /[ˈbʌ.ɾɚ.flaɪ]/
01 n. A general name for the numerous species of diurnal Lepidoptera.
pl. Butterflies
  1. 1.
    A general name for the numerous species of diurnal Lepidoptera.(Zool.)
Phrases & compounds
Asclepias butterfly — See under Asclepias.
Butterfly fish — the ocellated blenny (Blennius ocellaris) of Europe. See Blenny. The term is also applied to the flying gurnard.
Butterfly shell — a shell of the genus Voluta.
Butterfly valve — a kind of double clack valve, consisting of two semicircular clappers or wings hinged to a cross rib in the pump bucket. When open it somewhat resembles a butterfly in shape.