/ Dictionary / Index U unicellulate: Meaning and Definition of Find definitions for: u•ni•cel•lu•late Pronunciation: (y"nu-sel'yu-lit, -lāt"), [key] — n. a unicellular organism. a single-celled protist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unicellular unicolor Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language