carrier oil

noun2

1. •
   An oil that is easily absorbed by the skin that is used to dilute an essential oil for use in cosmetics, massage or aromatherapy.

   • Always blend them with a suitable carrier oil in the appropriate dilution when using them for massage. — 2011
2. •
   Any oil used to dissolve and carry an oil-soluble substance into or out of a compound.

   • Stearic acid dissolved in a carrier oil can effect a strong reduction in the coefficient of friction for metal rubbed against metal. — 1985