/ Dictionary / Index W whooper swan: Meaning and Definition of Find definitions for: whoop'er swan" Pronunciation: [key] a common, Old World swan, Cygnus cygnus, distinguished by a yellow patch at the base of its bill, noted for its whooping cry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. whooper whooping cough Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language