D defs.my
Entry 1 sense Webster, 1913

Cnidaria

/(nĭ*dā"rĭ*ȧ)/ · Cni·da·ri·a · IPA /naɪˈdɛɹi.ə/
01 n. pl. A comprehensive group equivalent to the true Cœlenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cell…
  1. 1.
    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.(Zool.) See: Coelenterata