anthracitic

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an·thra·cite

A0331300 (ăn′thrə-sīt′)n. A dense, shiny coal that has a high carbon content and little volatile matter and burns with a clean flame. Also called hard coal.
[Probably ultimately from Greek anthrakitis, a kind of coal, from anthrax, anthrak-, charcoal.]
an′thra·cit′ic (-sĭt′ĭk) adj.
Thesaurus
Adj.1.anthracitic - relating to or resembling anthracite coal