nonvolatile animal or plant oil

an oil that is not volatile and will not evaporate if left exposed

The non-volatile oil obtained from a botanical base such as a vegetable oil.

A fixed oil is chemically the same as a fat, but is generally liquid ie. Almond oil, grapeseed oil.

A vegetable oil, non-volatile. More info

fatty, dense, non-volatile vegetable oil, often used to dilute essential oils