/ak'euhn thop'teuh rij"ee euhn/ , adj.
1. belonging or pertaining to the Acanthopterygii (Acanthopteri), the group of spiny-finned fishes, including the bass and perch.
n.
2. an acanthopterygian fish.
[ 1825-35; Acanthopterygi ( i ) ( acantho- ACANTHO- + Gk pterýgi ( on ) small wing, fin + L -i masc. pl. ending) + -AN ]