Charcoal
来自Big Physics
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late Middle English: probably related to coal in the early sense ‘charcoal’.
wiktionary
From Middle English charcole, from charren(“to change, turn”) + cole(“coal”), from Old English cierran(“to change, turn”) + col(“coal”); equivalent to char(Etymology 3 (verb)) + coal.
etymonline
charcoal (n.)
"coal made by subjecting wood to smothered combustion," mid-14c., charcole, first element is either Old French charbon "charcoal," or, on the current theory, obsolete charren "to turn" (from Old English cerran) + cole "coal," thus, "to turn to coal."
