ефір

Etymology
Borrowed from.

Noun

 * 1) ether (organic chemistry: a compound containing an oxygen atom bonded to two hydrocarbon groups)
 * 2)  ether The substance formerly supposed to fill the upper regions of the atmosphere; by extension the sky, the heavens; the void, nothingness.
 * 3)  luminiferous aether, aether
 * 4)  ether
 * 5)  air, ether