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English definition of “essential oil”

essential oil

noun [C]    
an oil, usually with a strong smell, that is taken from a plant and is used to make perfume, or for rubbing into a person's body during massage: Lavender, peppermint, and jasmine are essential oils which are widely available.Toiletry and perfumesPhysiotherapy, massage and osteopathy
(Definition of essential oil noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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