coelenteron

noun
coe·len·ter·on | \si-ˈlen-tə-ˌrän, -rən\
plural coelentera\si-ˈlen-tə-rə \

Definition of coelenteron 

: the internal cavity of a coelenterate

First Known Use of coelenteron

1885, in the meaning defined above

History and Etymology for coelenteron

New Latin, from Greek koilos + enteron

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The first known use of coelenteron was in 1885

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