A paint in which the colours or pigments are suspended in an oil-based carrier such as linseed oil which hardens on exposure to the air.

A painting done with oil paints. / (uncountable) The art of painting with oil paints. / (Britain, humorous, litotes, chiefly in the negative) A physically attractive person.

A hole drilled into the earth from which petroleum is pumped.

The civilized world or inhabited world, referring to the location and time in the known world where human civilization exists.

A vegetable oil, pressed from olives, and used in cooking and as a salad dressing; it is high in unsaturated fatty acids.

A volatile oil, used to make perfumes and flavourings, especially one having the characteristic odour of the plant from which it is obtained.

(idiomatic) To work studiously, especially late into the night.

An oil used not for lubrication but as a component of another material, or as a carrier of other products.

The pale yellow vegetable oil extracted from the castor bean; used as a laxative and an industrial lubricant.

An olive oil obtained from the first pressing of the olives.