10 letters · 15 points in Scrabble
noun a hard natural coal that burns slowly and gives intense heat
originVia Latin from Ancient Greek ἀνθρακῖτις (anthrakîtis, “a kind of coal”), from ἄνθραξ (ánthrax, “charcoal”). By surface analysis, anthrac- + -ite.
Etymology from Wiktionary, CC BY-SA 3.0