/ Dictionary / Index T trichocyst: Meaning and Definition of Find definitions for: trich•o•cyst Pronunciation: (trik'u-sist"), [key] — n. Zool. an organ of offense and defense embedded in the outer cytoplasm of certain protozoans, consisting of a small elongated sac containing a fine, hairlike filament capable of being ejected. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tricho- trichogramma Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language