(from the article `circulation`) ...and corals may also grow to considerable size and exhibit complex external structure that, again, has the effect of increasing surface area. Their ... ...stinging capsules, known as nematocysts or cnidae, which give the phylum its name. The alternative name, coelenterate, refers to their simple ... ...
The single body cavity within the body of a cnidarian (coelenterate). It serves as a gut and as a hydrostatic skeleton, and in some groups eggs and sperm are discharged into it. The coelenteron has a single opening, which is closable by a sphincter.
[n] - the saclike body cavity of a coelenterate
noun the saclike body cavity of a coelenterate
the body cavity of a coelenterate.