from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any vertebrate with jaws, including amphibians, reptiles, mammals, and most modern fish.
from The Century Dictionary and Cyclopedia
- n. A member of the Gnathostomata, or vertebrates having true jaws.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a vertebrate animal possessing true jaws
Certainly it does not acheive a result more consonant with the accepted gnathostome phylogeny.