Oil (noun)

1. A viscous liquid derived from petroleum, especially for use as a fuel or lubricant.
2. Any of various other liquids or substances resembling or compared to oil, such as butter or a cosmetic oil.

Origin:

Old english ōli, of germanic origin; related to dutch olie and german öl.

Examples:

1. He poured some oil into the car's engine.
2. The company is one of the largest producers of oil and gas.
3. The painting was done with oil on canvas.
4. The food is cooked in hot oil.
5. She put some oil on her skin to moisturize.