GNU Collaborative International Dictionary of English

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1.       
   Ethereal , a.
    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.
   1913 Webster
   Go, heavenly guest, ethereal messenger.
   Milton.
   
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   Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.
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   Vast chain of being, which from God began,
   Natures ethereal, human, angel, man.
   Pope.
   
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   (Chem.) Pertaining to, derived from, or resembling, ether; as, ethereal salts.
   1913 Webster
   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.
   1913 Webster