/ Dictionary / Index W willow ptarmigan: Meaning and Definition of Find definitions for: wil'low ptar'migan Pronunciation: [key] a ptarmigan, Lagopus lagopus, of arctic and subarctic regions of the New and Old Worlds, having brown, mottled plumage in summer and white plumage in winter. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. willow pattern Willow Run Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language