Source : Webster's Revised Unabridged Dictionary (1913)

Acanthopterygii \Ac`an*thop`ter*yg"i*i\, n. pl. [NL., from Gr. ?
   thorn + ? fin, dim. fr. ? wing.] (Zo["o]l.)
   An order of fishes having some of the rays of the dorsal,
   ventral, and anal fins unarticulated and spinelike, as the
   perch.

Source : WordNet®

Acanthopterygii
     n : teleost fishes having fins with sharp bony rays [syn: {superorder
         Acanthopterygii}]