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coe·len·ter·on | \ si-ˈlen-tə-ˌrän 
, -rən \
, -rən \ plural coelentera\ si-ˈlen-tə-rə \
\Definition of coelenteron
: the internal cavity of a cnidarian
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Time Traveler for coelenteron
The first known use of coelenteron was in 1885
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