fuel

n. 1 material for burning or as a source of heat, power, or nuclear energy. 2 food as a source of energy. 3 thing that sustains or inflames passion etc. v. (-ll-; us -l-) 1 supply with, take in, or get, fuel. 2 inflame (feeling etc.). [french from latin]

n. Any matter used to produce heat by burning; that which feeds fire; combustible matter used for fires, as wood, coal, peat, etc.