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The Collaborative International Dictionary
Cyclostomous

Cyclostome \Cy"clo*stome\ (s?"kl?-st?m), Cyclostomous \Cy*clos"to*mous\ (s?-kl?s"t?-m?s), a. (Zo["o]l.) Pertaining to the Cyclostomi. [1913 Webster] ||

Wiktionary
cyclostomous

a. (context zoology English) Relating to the cyclostomes.