cyclostome
noun
cy·clo·stome ˈsī-klə-ˌstōm 
: any of a class (Cyclostomata) of jawless fishes having a large sucking mouth and comprising the hagfishes and lampreys
Word History
Etymology
ultimately from Greek kykl- + stoma mouth — more at stomach entry 1
First Known Use
1835, in the meaning defined above
Medical Definition
cyclostome
noun
cy·clo·stome ˈsī-klə-ˌstōm, ˈsik-lə-
: any vertebrate of the class or order Cyclostomata
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