(business, derogatory) The world's largest oil and gas companies (supermajors), understood as a business group having significant political, economic, or social power.

an essential oil obtained from the fruit of the common juniper Juniperus communis

(microscopy) A transparent oil of a specific refractive index and viscosity used to increase the resolving power of a microscope by filling the gap between the objective lens and the specimen.

A mixture of oils obtained from the livers of several kinds of fish frequenting the Malabar Coast of India and the neighbourhood of Karachi.

Lubricating oil contained in the sump of an engine; the waste oil drained from the sump at the time of an oil change.

A drum (container) used to transport oil

(mechanical engineering, petrochemistry, maritime) Synonym of bunker fuel.

Alternative letter-case form of big oil

A form of edible oil extracted from seeds.

(of a lamp or lantern) Illuminated by burning oil.