Definition of plumbeous in US English:

plumbeous

adjective

Ornithology
  • Of the dull gray color of lead.

    • ‘The adult Plumbeous Kite is pale ashy grey on the head and upper back.’

Origin

Late 16th century: from Latin plumbeus ‘leaden’ (from plumbum ‘lead’) + -ous.

Pronunciation

plumbeous

/ˈpləmbēəs//ˈpləmbiəs/