Also called diethyl ether , diethyl oxide , ethyl ether , ethyl oxide , sulfuric ether. Chemistry, Pharmacology . a colorless, highly volatile, flammable liquid, C 4 H 10 O, having an aromatic odor and sweet, burning taste, derived from ethyl alcohol by the action of sulfuric acid

used as a solvent and, formerly, as an inhalant anesthetic.

Chemistry . (formerly) one of a class of compounds in which two organic groups are attached directly to an oxygen atom, having the general formula ROR.

the upper regions of space; the clear sky; the heavens.

the medium supposed by the ancients to fill the upper regions of space.

Physics . a hypothetical substance supposed to occupy all space, postulated to account for the propagation of electromagnetic radiation through space.

noun

air , anesthetic , atmosphere , compound , element , gas , heavens , skies , sky , solvent