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enterocoele

American  
[en-ter-uh-seel] / ˈɛn tər əˌsil /
Or enterocoel

noun

Anatomy.
  1. the body cavity formed from an outpocketing of the archenteron, typical of echinoderms and chordates.


Etymology

Origin of enterocoele

First recorded in 1875–80; entero- + -coele