- fuel (n.)
- early 14c., from Old French foaile "bundle of firewood," from Vulgar Latin legal term *focalia "right to demand material for making fire," neuter plural of Latin focalis "pertaining to a hearth," from focus "hearth" (see focus). Figurative use from 1570s.
- fuel (v.)
- 1590s, from fuel (n.). Related: Fueled; fueling.