Definition: a carbonaceous material obtained by heating wood or other organic matter in the absence of air
Similar words: C, carbon, atomic number 6
Definition: an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
Similar words: fuel
Definition: a substance that can be consumed to produce energy
Usage: more fuel is needed during the winter months; they developed alternative fuels for aircraft
Synonyms: brown coal, wood coal, lignite
Definition: intermediate between peat and bituminous coal
Similar words: coal
Definition: fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
Similar words: humate
Definition: material that is high in humic acids