Webster's Revised Unabridged Dictionary · 1913

Fuel

Fuel , noun

[Old French fouail, fuail, or fouaille, fuaille, Late Latin focalium, focale, from Latin focus hearth, fireplace, in Late Latin, fire. See Focus.]

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.
Collocations (1)
Artificial fuel , fuel consisting of small particles, as coal dust, sawdust, etc., consolidated into lumps or blocks.

Fuel , transitive verb

1.
To feed with fuel. [Obsolete]
Never, alas I the dreadful name, That fuels the infernal flame. — Cowley
2.
To store or furnish with fuel or firing. [Obsolete]
Well watered and well fueled. — Sir H. Wotton