Entry 2 senses Webster, 1913 Plumbago · Plum·ba·go · IPA /pləmˈbeɪɡoʊ/ 01 n. Same as Graphite. 1. Same as Graphite.(Min.) See: Graphite 2. A genus of herbaceous plants with pretty salver-shaped corollas, usually blue or violet; leadwort.(Bot.)