Of or relating to the group Actinopterygii of bony fishes characterized by membranous fins supported by slender rays or spines.
The group includes all extant bony fishes with the exception of coelacanths and lungfishes (sarcopterygians or lobe-finned fishes). It is now most often ranked as a class.
A fish of the group Actinopterygii; a ray-finned fish.
Late 19th century; earliest use found in Edward Cope (1840–1897). From actino- + -pterygian, after scientific Latin Actinopterygii.