The Collaborative International Dictionary of English v.0.48:
butterflyfish \butterflyfish\ n. tropical gurnardlike fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins. Syn: flying gurnard, flying robin. [WordNet 1.5]WordNet (r) 3.0 (2006):
butterflyfish n 1: tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins [syn: flying gurnard, flying robin, butterflyfish]