Source : Webster's Revised Unabridged Dictionary (1913)

Coelentera \C[oe]*len"te*ra\or Coelenterata
\C[oe]*len`te*ra"ta\, n. pl. [NL., fr. Gr. ? hollow + ?
   intestines.] (Zo["o]l.)
   A comprehensive group of Invertebrata, mostly marine,
   comprising the Anthozoa, Hydrozoa, and Ctenophora. The name
   implies that the stomach and body cavities are one. The group
   is sometimes enlarged so as to include the sponges.

Source : WordNet®

coelentera
     See {coelenteron}

coelenteron
     n : the saclike body cavity of a coelenterate
     [also: {coelentera} (pl)]