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gnathostome

gna·thos·tome [ náythə stm, náthə stm ] (plural gna·thos·tomes)


noun 
Definition:
 
animal with backbone and jaws: a vertebrate that has a mouth with jaws, as do all vertebrates except agnathans. Lampreys and hagfish are gnathostomes. Superclass Gnathostomata.

[Early 20th century. < Greek gnathos "jaw" + stoma "mouth"]
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