/ Dictionary / Index B birthroot: Meaning and Definition of Find definitions for: birth•root Pronunciation: (bûrth'rt", -root"), [key] — n. Also calleda trillium, Trillium erectum, the roots of which were formerly used in medicine as an astringent. any of certain other species of trillium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: birthroot (Thesaurus) birthright birthstone Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language