2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Gnathostoma \Gna*thos"to*ma\, n. pl. [NL., from Gr. gna`qos the jaw + ?, ?, the mouth.] (Zool.) A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them. [Written also {Gnathostomata}.] From WordNet (r) 2.0 [wn]: Gnathostomata n : comprising all vertebrates with upper and lower jaws [syn: {superclass Gnathostomata}]
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