What does the word fuel mean?

Usage examples for fuel

  1. Thus you see the difference between carbon and lead or iron: if we choose iron, which gives so wonderful a result in our application of this fuel, either as light or heat. – The Chemical History Of A Candle by Michael Faraday
  2. The fire in such eyes is always cold, for hunger is poor fuel to the native flame of life. – The Judgment House by Gilbert Parker
  3. Fun is the fuel For driving off cold. – Cole's Funny Picture Book No. 1 by Edward William Cole