lobe-finned fish lo·be·fin·nedfish uncommon noun 1. any fish of the order Crossopterygii; most known only in fossil form Synonymscrossopterygianlobefinlobe-finned fish Related words Broader terms bony fish Narrower terms coelacanth Parts Crossopterygii WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
