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Definition of: cyclostome
(sī′klə·stōm, sik′lə-) noun
Any of a class (Cyclostomata) of primitive, carnivorous, aquatic vertebrates, having round, suctorial mouths devoid of jaws, and a single nostril; the lampreys and hagfishes.
—adjective Having a round mouth; also, pertaining to the cyclostomes: also cy·clos·to·mate (sī·klos′tə·māt), cy·clo·stom·a·tous (sī′klə·stom′ə·təs).
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