fixed oil

Also called non-volatile or carrier oil, a fixed oil is derived by pressing the seeds of a plant.*  It won’t evaporate at room temperature and will leave a stain. It is insoluble in water.

Fixed oils are used in making soaps and lotions, and also as solvents for extracting plant properties. Glycerin is a by-product of fixed oils.

*Fixed oils are also derived from animals, but this site isn’t about that. 🙂

Related: essential oil, glycerin