Source : Webster's Revised Unabridged Dictionary (1913)

Chilostoma \Chi*los"to*ma\, Chilostomata \Chi*lo*stom"a*ta\, n.
   pl. [NL., fr. Gr. ? + ?, ?, outh.] (Zo["o]l.)
   An extensive suborder of marine Bryozoa, mostly with
   calcareous shells. They have a movable lip and a lid to close
   the aperture of the cells. [Also written {Chillostomata}.]