What does the word oil mean?

Usage examples for oil

  1. They carried the oil lamps from the car and thus made good progress. – The Auto Boys' Mystery by James A. Braden
  2. You are in the oil business now, are you? – The Secret of the Night by Gaston Leroux
  3. The time is approaching when oil, gas, and coal will not supply the power needed in America. – The Enchanted Canyon by Honoré Willsie Morrow