‖Gna‐thos″to‐ma (?), n. pl. [NL., from Gr. γνάθοσ the jaw + �, �, the mouth.] (Zoöl.) 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.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.