coelentera


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coe·len·ter·on

 (sĭ-lĕn′tə-rŏn′, -tər-ən)
n. pl. coe·len·te·ra (-tər-ə)
The saclike gastrovascular cavity of a cnidarian or a ctenophore.

[New Latin : Greek koilos, hollow; see -coel + enteron.]