ethereal : Idioms & Phrases
(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 oenanthic ether).
(Chem.), a salt of some organic radical as a base; an ester.