/ Dictionary / Index B Birtwhistle: Meaning and Definition of Find definitions for: Birt•whis•tle Pronunciation: (bûrt'hwis"ul, -wis"-), [key] born 1934, English composer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. birthwort family bis Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language