Definition of plumaceous in US English:

plumaceous

adjective

Biology
  • Feathery; (in recent use) specifically of the nature of a contour feather.

Origin

Mid 18th century; earliest use found in William Porterfield (1695–1771). From post-classical Latin plumaceus feathery + -ous.

Pronunciation

plumaceous

/pluːˈmeɪʃəs/