cyclostome noun. ['sʌɪklǝstǝʊm] M19.
[from CYCLO- + Greek stoma mouth.]
A fish of the former taxon Cyclostomata (now incorporated in Agnatha: cf. AGNATHAN), which includes primitive forms (the lampreys and hagfishes) having a round sucking mouth.

■ cyclo'stomatous adjective M19.

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