/ Dictionary / Index C Cnidaria: Meaning and Definition of Find definitions for: Cni•dar•i•a Pronunciation: (nī-dâr'ē-u), [key] — n. Zool. an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cnidaria (Thesaurus) cnida cnidarian Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language