A natural dark brown to black graphitelike material used as a fuel, formed from fossilized plants and consisting of amorphous carbon with various organic and some inorganic compounds.
파생어
coaly [형]
예문
1. brown coal (갈탄) 2. hard coal (무연탄) 3. soft coal (역청탄) 4. small coal (분탄) 5. cook food on live coals (피운 숯불에 음식을 요리하다)
