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eclipse plumage

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noun Ornithology.
  1. the dull plumage developed in some brightly colored birds after the breeding season.
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Origin of eclipse plumage

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for eclipse plumage

eclipse plumage

noun
  1. seasonal plumage that occurs in certain birds after the breeding plumage and before the winter plumage: characterized by dull coloration
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012