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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 But·ter·fly n.; pl. Butterflies   Zool. A general name for the numerous species of diurnal Lepidoptera.
 Note: [See Illust. under Aphrodite.]
 Asclepias butterfly. See under Asclepias.
 Butterfly fish Zool., the ocellated blenny (Blennius ocellaris) of Europe. See Blenny. The term is also applied to the flying gurnard.
 Butterfly shell Zool., a shell of the genus Voluta.
 Butterfly valve Mech., 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.
 

From: WordNet (r) 2.0

 butterfly valve
      n : a valve in a carburetor that consists of a disc that turns
          and acts as a throttle