volatile oil

n.
A rapidly evaporating oil, especially an essential oil, that does not leave a stain.

n.

A rapidly evaporating oil of plant derivation, especially an essential oil, that is capable of distillation and that does not leave a stain. Also called ethereal oil.

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The noun has one meaning:

Meaning #1: a volatile oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings
  Synonym: essential oil

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