Definition of actinopterygian in English:

actinopterygian

adjective

Zoology Palaeontology
  • Of or relating to the group Actinopterygii of bony fishes characterized by membranous fins supported by slender rays or spines.

noun

Zoology Palaeontology
  • A fish of the group Actinopterygii; a ray-finned fish.

Origin

Late 19th century; earliest use found in Edward Cope (1840–1897). From actino- + -pterygian, after scientific Latin Actinopterygii.

Pronunciation:

actinopterygian

/ˌaktɪˌnɒptəˈrɪdʒɪən//ˌaktɪnəʊtəˈrɪdʒɪən/