/ Dictionary / Index C cnida: Meaning and Definition of Find definitions for: cni•da Pronunciation: (nī'du), [key] — pl. -dae a nematocyst. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cnemis Cnidaria Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language