From The Collaborative International Dictionary of English v.0.44 [gcide]:
Graphite \Graph"ite\, noun [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}.
{Graphite battery} (Elec.), a voltaic battery consisting of zinc and carbon in sulphuric acid, or other exciting liquid.
From WordNet (r) 2.0 [wn]:
noun
1: used as a lubricant and as a moderator in nuclear reactors [syn: {black lead}, {plumbago}]
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