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

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.

The hot pungent oil expressed from mustard seeds; used sparingly as a food dressing. / (organic chemistry) The essential oil allyl isothiocyanate, also obtained from mustard seeds.

Oil extracted from sesame seeds (often after roasting) and used to flavor foods.

An oil, from the ylang ylang tree (Cananga odorata). / A mixture, once used to smooth the hair, consisting of oil of the ylang ylang tree and other oils.

A cooking ingredient consisting of flavorless oil infused with truffle.

A synthetic crude oil obtained by the pyrolysis, hydrogenation, or thermal dissolution of oil shale. / A crude oil obtained from low permeability petroleum-bearing formations (shales).

A sedimentary rock containing kerogen from which petroleum-like shale oil can be produced by pyrolysis, hydrogenation, or thermal dissolution.

An oil, produced from the seeds of the gorli shrub, Oncoba echinata, that has been used in the treatment of leprosy.