crossopterygian Meaning, Definition & Usage

  1. noun any fish of the order Crossopterygii; most known only in fossil form
    lobefin; lobe-finned fish.

WordNet

Cros*sop`ter*yg"i*an adjective
Definitions
  1. (Zoöl.) Of or pertaining to the Crossopterygii. -- n. One of the Crossopterygii.

Webster 1913