plumbago
oxford
views updated May 29 2018plumbago †yellow and red oxides of lead XVII; black lead, graphite XVIII: genus of plants, leadwort XVIII. — L.
plumbāgō (i) lead ore, (ii) leadwort, flea-wort, f.
plumbum lead (see prec.).
Hence
plumbaginous XVIII.
The Concise Oxford Dictionary of English Etymology T. F. HOAD