1. Any matter used to produce heat by burning; that which feeds fire; combustible matter used for fires, as wood, coal, peat, etc.
2. Anything that serves to feed or increase passion or excitement. Artificial fuel, fuel consisting of small particles, as coal dust, sawdust, etc, consolidated into lumps or blocks.
Origin: OF. Fouail, fuail, or fouaille, fuaille, LL. Focalium, focale, fr. L. Focus hearth, fireplace, in LL, fire. See Focus Formerly written also fewel.