Webster's Revised Unabridged Dictionary · 1913

Cyclostomata

Cyclostomata (s?`kl?-st?m"?-t?) , noun, plural

[New Latin, from Greek ky`klos circle + sto`ma, -atos mouth.]

(Zoology) A division of Bryozoa, in which the cells have circular apertures.

Also: Cyclostoma