/ Dictionary / Index P purple trillium: Meaning and Definition of Find definitions for: pur'ple tril'lium Pronunciation: [key] birthroot (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. purple shore crab purplish Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language