/ ˈænθrəsaɪt; NAmE / noun
[ U ] a very hard type of coal that burns slowly without producing a lot of smoke or flames
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WORD ORIGIN
late 16th cent. (denoting a gem described by Pliny and said to resemble coals, supposedly hydrophane, a type of opal): from Greek anthrakitēs , from anthrax , anthrak- coal.