GNU Collaborative International Dictionary of English

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1.       
   { ‖Cœlentera  or ‖Cœlenterata, } n. pl. [NL., fr. Gr. κοῖλος hollow +  intestines.] (Zool.) 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.
   1913 Webster