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The Collaborative International Dictionary
Coelentera

Coelentera \C[oe]*len"te*ra\or ||Coelenterata \C[oe]*len`te*ra"ta\, n. pl. [NL., fr. Gr. koi^los 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.

Wiktionary
coelentera

n. (plural of coelenteron English)

WordNet
coelentera
coelenteron
  1. n. the saclike body cavity of a coelenterate

  2. [also: coelentera (pl)]