essential oil
noun [ C ] uk/ɪˌsen.ʃəl ˈɔɪl/ us/ɪˌsen.ʃəl ˈɔɪl/
（香）精油
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 that are widely available. 熏衣草油、薄荷油和茉莉香精是很多地方都可以买到的精油。