FUEL

I. noun Usage: often attributive Etymology: Middle English fewel, from Anglo-French fuail, feuaile, from Vulgar Latin *focalia, from Latin focus hearth Date: 13th century 1. a material used to produce heat or power by burning, nutritive material, a material from which atomic energy can be liberated especially in a reactor, a source of sustenance or incentive ; reinforcement , II. verb (-eled or -elled; -eling or -elling) Date: 1592 transitive verb to provide with ~, support , stimulate , intransitive verb to take in ~