Cnidaria :: Cnidaria (n. pl.) A comprehensive group equivalent to the true Coelenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cells (cnidae) in the tissues. See Coelenterata..
Cnidoblast :: Cnidoblast (n.) One of the cells which, in the Coelenterata, develop into cnidae..
Cnidocil :: Cnidocil (n.) The fine filiform process of a cnidoblast.