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: Webster's Revised Unabridged Dictionary (1913)