essential oil 名詞
 揮髮油,精油,香精油


 oe·nan·thic a.  Chem. Having, or imparting, the odor characteristic of the bouquet of wine; specifically used, formerly, to designate an acid (oenanthic acid) whose ethereal salts were supposed to occasion the peculiar bouquet, or aroma, of old wine.  Cf. oenanthylic.
 oenanthic acid, oenanthic acid Chem., an acid (C6H13.CO.OH) obtained from œnanthic ether by the action of alkalies; called also n-heptanoic acid, 1-heptanecarboxylic acid, enanthic acid, enanthylic acid and oenanthylic acid.  It has the odor of sour sweat.  It has the CAS registry number 111-14-8.
 oenanthic ether, an ethereal substance (not to be confused with the bouquet, or aroma, of wine) found in wine lees, and consisting of a complex mixture of the ethereal salts of several of the higher acids of the acetic acid series.  It has an ethereal odor, and it used in flavoring artificial wines and liquors.  Called also oil of wine. See Essential oil, under Essential.

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 E·the·re·al a.
 1. Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions.
    Go, heavenly guest, ethereal messenger.   --Milton.
 2. Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.
 Vast chain of being, which from God began,
 Natures ethereal, human, angel, man.   --Pope.
 3. Chem. Pertaining to, derived from, or resembling, ether; as, ethereal salts.
 Ethereal oil. Chem. See Essential oil, under Essential.
 Ethereal oil of wine Chem., a heavy, yellow, oily liquid consisting essentially of etherin, etherol, and ethyl sulphate.  It is the oily residuum left after etherification.  Called also heavy oil of wine (distinguished from oil of wine, or œnanthic ether).
 Ethereal salt Chem., a salt of some organic radical as a base; an ester.

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 essential oil
      n : an oil having the odor or flavor of the plant from which it
          comes; used in perfume and flavorings [syn: volatile oil]