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ethereal adjective

  /iˈθɪə̯.ri.əl/ , /iˈθɪɚ.i.əl/ , /əˈθɪə̯.ri.əl/ , /ɪˈθɪə.ɹɪ.əl/ , /ɪˈθɪɚ.i.əl/
  • Pertaining to the presupposition of an invisible air-like element permeating all of space, or to the higher regions beyond the earth or beyond the atmosphere.
 αιθέριος, αέρινος

ether noun

  /ˈi.θɚ/ , /ˈiː.θə/
  • (uncountable, literary, or, poetic) The substance formerly supposed to fill the upper regions of the atmosphere above the clouds, in particular as a medium breathed by deities.
  • (uncountable, physics, historical) Often as aether and more fully as luminiferous aether: a substance once thought to fill all unoccupied space that allowed electromagnetic waves to pass through it and interact with matter, without exerting any resistance to matter or energy; its existence was disproved by the 1887 Michelson–Morley experiment and the theory of relativity propounded by Albert Einstein (1879–1955).
  • (countable, organic compound) Any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups.
 αιθέρας
  • (uncountable, organic compound) Diethyl ether (C4H10O), an organic compound with a sweet odour used in the past as an anaesthetic.
 διαιθυλαιθέρας
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