PLUMBEOUS Meaning of PLUMBEOUS in English [ 'plʌmbɪəs ]■ adjective chiefly Ornithology of the dull grey colour of lead.OriginC16: from L. plumbeus 'leaden' (from plumbum 'lead') + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004