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Any of numerous animals of the group Gnathostomata, consisting of all vertebrates with jaws and including the mammals, birds, reptiles, amphibians, and fishes except for lampreys and hagfishes.

[From New Latin Gnathostomata, taxon name : Greek gnathos, jaw; see genu- in Indo-European roots + Greek stoma, stomat-, mouth.]

gnath′o·stome′ adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Zoology) any vertebrate of the superclass Gnathostomata, having a mouth with jaws, including all vertebrates except the agnathans
[from New Latin Gnathostomata, from Greek gnathos jaw + stoma mouth]
ˌgnathoˈstomatous adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.gnathostome - a vertebrate animal possessing true jaws
craniate, vertebrate - animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
Gnathostomata, superclass Gnathostomata - comprising all vertebrates with upper and lower jaws
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