/ Dictionary / Index J juvenal plumage: Meaning and Definition of Find definitions for: ju've•nal plum'age Pronunciation: ( j'vu-nl), [key] — Ornith. Ornith. the first plumage of birds, composed of contour feathers, which in certain species follows the naked nestling stage and in other species follows the molt of natal down. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Juvenal juvenescent Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language