(definition) by Webster 1913 Tue Dec 21 1999 at 23:55:24

Gna*thos"to*ma (?), n. pl. [NL., from Gr. 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.]

 

© Webster 1913.

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