Webster's English Dictionary

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fuel

1. fu.el \'fyu:(-*)l, 'fyu.(-*)l\ n [ME fewel, fr. OF fouaille, fr. feu 
   fire, fr. LL focus,] often attrib  fr. L, hearth - more at FOCUS 1a: a 
   material used to produce heat or power by burning  1b: nutritive material  
   1c: a material from which atomic energy can be liberated esp. in a reactor  
   2: a source of sustenance or incentive 
2. fuel vb or fu.eled or fu.elled;  or fu.el.ing;  or fu.el.ling 1: to 
   provide with fuel  2: SUPPORT, STIMULATE  : to take in fuel