acanthopteri

from The Collaborative International Dictionary of English v.0.48

Acanthopteri \Ac`an*thop"ter*i\, n. pl. [NL., from Gr. ? thorn +
   ? wing, fin.] (Zool.)
   A group of teleostean fishes having spiny fins. See
   {Acanthopterygii}.
   [1913 Webster]