‖Cni‐da″ri‐a (nĭ‐dā″rĭ‐ȧ), n. pl. [NL. See Cnida.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.