Cnidaria
Pronunciation : Cni*da"ri*a, n.
Part of Speech : pl.
Etymology : [NL. See Cnida.] (Zo?l.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913