ether ( defs 3–5 ).
(initial capital letter) the ancient Greek personification of the clear upper air of the sky.

aethereal [ih-theer-ee-uhl] , aetheric [ih-ther-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aether (ˈiːθə)
ether ether a variant spelling of ether

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


in physics, a theoretical, universal substance believed during the 19th century to act as the medium for transmission of electromagnetic waves (e.g., light and X rays) much as sound waves are transmitted by elastic media such as air. The ether was assumed to be weightless, transparent, frictionless, undetectable chemically or physically, and literally permeating all matter and space. The theory met with increasing difficulties as the nature of light and the structure of matter became better understood; it was seriously weakened (1881) by the Michelson-Morley experiment (q.v.), which was designed specifically to detect the motion of the Earth through the ether and which showed that there was no such effect

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Example sentences
His tenderness penetrating aether, soft prayer on the airwaves.
After all, this is why dense aether theory was introduced.
All these publications belong into new physics, which is dual to the existing
  one and compliant with dense aether theory.
The idea of the aether was eventually rejected because a better theory came
  along to replace the old one that was not working.
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