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n (organic compound|countable) A compound containing an oxygen atom bonded to two hydrocarbon groups.

n (organic compound|uncountable) diethyl ether | Diethyl ether (C₄H₁₀O), a compound used as an early anaesthetic.

n (context|ancient philosophy|and|alchemy|uncountable) A classical physical element, considered as prevalent in the heavens and inaccessible to humans. In some versions of alchemy, this was the fifth element in addition to air, earth, fire and water.

n (archaic|physics|uncountable) A substance (aether) once thought to fill all space that allowed electromagnetic waves to pass through it and interact with matter, without exerting any resistance to matter or energy (disproved by Einstein in his Theory of Relativity).

n (poetic|_|or|_|literary) The sky or heavens; the upper air.