Dictionary.com
Thesaurus.com

alternate plumage

American  

noun

Ornithology.

  1. (of birds having more than one plumage in their cycle of molts) the plumage of the second molt, usually brighter than the basic plumage.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.