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English definition of “oil”

oil

noun uk   /ɔɪl/ us  

oil noun (FUEL)

B1 [U] petroleum (= the black oil obtained from under the Earth's surface from which petrol comes): drilling for oil the oil industryPetroleum products especially when used as fuelFuels B1 [U] a thick liquid that comes from petroleum, used as a fuel and for making parts of machines move easily: diesel/lubricating oilLubricationFuelsPetroleum products especially when used as fuel

oil noun (FOR COOKING)

A2 [C or U] a smooth thick liquid produced from plants or animals that is used in cooking: olive/corn/vegetable/sunflower oilFats and oils in food and cooking

oil noun (FOR BODY/HAIR)

[C or U] a smooth thick liquid that is used to improve the appearance or quality of the skin or hair: bath oilCare for the hairToiletry and perfumes

oil noun (PAINT)

oils [plural] thick paints with an oil base, used for painting pictures: Do you paint in oils or watercolours?Painting and drawing materials

oil

verb [T] uk   /ɔɪl/ us  
to put oil on something, especially a machine, usually to make it work more easily without sticking
See also
Mechanical engineeringLubrication
(Definition of oil from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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