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.