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plumbago    
n. 石墨

石墨

plumbago
n 1: used as a lubricant and as a moderator in nuclear reactors
[synonym: {graphite}, {black lead}, {plumbago}]
2: any plumbaginaceous plant of the genus Plumbago

Graphite \Graph"ite\, n. [Gr. gra`fein to write: cf. F.
graphite. See {Graphic}.] (Min.)
Native carbon in hexagonal crystals, also foliated or
granular massive, of black color and metallic luster, and so
soft as to leave a trace on paper. It is used for pencils
(improperly called lead pencils), for crucibles, and as a
lubricator, etc. Often called {plumbago} or {black lead}.
[1913 Webster]

{Graphite battery} (Elec.), a voltaic battery consisting of
zinc and carbon in sulphuric acid, or other exciting
liquid.
[1913 Webster]


Plumbago \Plum*ba"go\, n. [L., from plumbum lead.]
1. (Min.) Same as {Graphite}.
[1913 Webster]

2. (Bot.) A genus of herbaceous plants with pretty
salver-shaped corollas, usually blue or violet; leadwort.
[1913 Webster] Plumbean


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