Source : Webster's Revised Unabridged Dictionary (1913)

Cyclostomata \Cy`clo*stom"a*ta\ (s?`kl?-st?m"?-t?), Cyclostoma
\Cy*clos"to*ma\ (s?-kl?s"t?-m?), n. pl. [NL., fr. Gr. ky`klos
   circle + sto`ma, -atos mouth.] (Zo["o]l.)
   A division of Bryozoa, in which the cells have circular
   apertures.

Source : WordNet®

Cyclostomata
     n : primitive jawless aquatic vertebrate: lampreys; hagfishes
         [syn: {order Cyclostomata}]