Meaning of “oil” - Learner’s Dictionary

oil

noun [ U ] us uk /ɔɪl/
FUEL

B1 a thick liquid that comes from under the Earth's surface that is used as a fuel and for making parts of machines move smoothly:

an oil company
an oil well

More examples

COOKING

A2 a thick liquid produced from plants or animals that is used in cooking:

→ See also crude oil , olive oil

(Definition of “oil” from the Cambridge Learner’s Dictionary © Cambridge University Press)