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. soft coal (역청탄) 2. brown coal (갈탄) 3. hard coal (무연탄) 4. small coal (분탄) 5. put coals in the stove (스토브에 석탄을 넣다)
