/ Dictionary / Index N nematocyst: Meaning and Definition of Find definitions for: nem•a•to•cyst Pronunciation: (nem'u-tu-sist", ni-mat'u-), [key] — n. Zool. an organ in coelenterates consisting of a minute capsule containing an ejectable thread that causes a sting. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nematocide nematode Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language