The story
- Old English · inherited fromcierran“to change, turn”
- Middle English · inherited fromcharcole
- English todaycharcoal
From Middle English charcole, from charren (“to change, turn”) + cole (“coal”), from Old English cierran (“to change, turn”) + col (“coal”). By surface analysis, char (Etymology 3 [verb]) + coal.
Etymology from Wiktionary, CC BY-SA 4.0.