plumbeous
/ˈplʌmbɪəs
/adjective
1Of or like lead.His nickel plating had worn off in places, revealing the plumbeous alloy beneath.
1.1 Ornithology Of the dull grey colour 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.