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Meaning of nuptial plumage

nup'tial plum'age

Pronunciation: [key]
— Ornith. Ornith.
  1. the plumage assumed by a male bird during the courtship period, esp. in those species that are more colorful at this period. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.