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From The Collaborative International Dictionary of English v.0.48:
Ethereal \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. [1913 Webster] Go, heavenly guest, ethereal messenger. --Milton. [1913 Webster] 2. Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc. [1913 Webster] Vast chain of being, which from God began, Natures ethereal, human, angel, man. --Pope. [1913 Webster] 3. (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 [oe]nanthic ether). Ethereal salt (Chem.), a salt of some organic radical as a base; an ester. [1913 Webster]