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[Latin plumbāgō, lead ore, a kind of plant, from plumbum, lead (the plant perhaps being so called because of the color of its flowers, or of another of its parts, or from the fact that it was used to cure a livid discoloration of the eyelid).]
n, pl -gos
1. (Plants) any plumbaginaceous plant of the genus Plumbago, of warm regions, having clusters of blue, white, or red flowers. See also leadwort
2. (Elements & Compounds) another name for graphite
[C17: from Latin: lead ore, leadwort, translation of Greek polubdaina lead ore, from polubdos lead]
a soft native carbon occurring in black to dark gray foliated masses: used for pencil leads, as a lubricant, as a moderator in nuclear reactors, and for making crucibles and other refractories; plumbago.
[1790–1800; < German Graphit < Greek gráph(ein) to write, draw + German -it -ite1]
gra•phit•ic (grəˈfɪt ɪk) adj.
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|Noun||1.||plumbago - used as a lubricant and as a moderator in nuclear reactors|
pencil lead, lead - mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
atomic number 6, carbon, C - an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
pencil - graphite (or a similar substance) used in such a way as to be a medium of communication; "the words were scribbled in pencil"; "this artist's favorite medium is pencil"
|2.||plumbago - any plumbaginaceous plant of the genus Plumbago|
genus Plumbago - shrubs and herbs and woody vines of warm regions: leadwort