/ Dictionary / Index B black swallowtail: Meaning and Definition of Find definitions for: black' swal'lowtail. Pronunciation: [key] See under(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. black sucker black swallowwort Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language