(n) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms, Syn.cnidarian
The Collaborative International Dictionary of English (GCIDE) v.0.53
‖n.; pl.Cnidæ [ NL., fr. Gr. kni`dh nettle, sea nettle. ] (Zool.) One of the peculiar stinging cells found in Cœlenterata; a nematocyst; a lasso cell. [ 1913 Webster ]
‖n. pl. [ NL. See Cnida. ] (Zool.) A comprehensive group equivalent to the true Cœlenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cells (cnidae) in the tissues. See Coelenterata. [ 1913 Webster ]
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