挥发油 huīfāyóu volatile oil Definitions Defs Origin Strokes Stroke Words Sentences Sents 挥发 揮發 huīfā to evaporate; volatilization to volatilize; to evaporate; (of a liquid or solid) to turn into gas at room temperature油 yóu noun oil oil; fat; grease; any of various liquid fats or hydrocarbons used as food, fuel, or lubricants