/ Dictionary / Index P Protozoa: Meaning and Definition of Find definitions for: Pro•to•zo•a Pronunciation: (prō"tu-zō'u), [key] — n. a major grouping or superphylum of the kingdom Protista, comprising the protozoans. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: protozoa (Thesaurus) protoxylem protozoan Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language