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ether.

The substance formerly supposed to fill the upper regions of the atmosphere above the clouds, in particular as a medium breathed by deities.

5 characters2 syllables approx.English language

Meaning & usage

noun/ˈiː.θə/Received-Pronunciation/ˈi.θɚ/General-American
  1. The substance formerly supposed to fill the upper regions of the atmosphere above the clouds, in particular as a medium breathed by deities. The medium breathed by human beings; the air.

    broadly · countable · literary · poetic · uncountable
  2. The substance formerly supposed to fill the upper regions of the atmosphere above the clouds, in particular as a medium breathed by deities. The sky, the heavens; the void, nothingness.

    broadly · countable · literary · poetic · uncountable
  3. Often as aether and more fully as luminiferous aether: The hypothetical substance permeating space, functioning as a medium for electromagnetic waves to propagate through, and which does not exert resistance to the movement of matter; its existence is incompatible with Einstein's theory of relativity; famously found to be undetectable by the 1887 Michelson–Morley experiment.

    historical · uncountable
  4. The atmosphere or space as a medium for broadcasting radio and television signals; also, a notional space through which Internet and other digital communications take place; cyberspace.

    colloquial · uncountable
  5. A particular quality created by or surrounding an object, person, or place; an atmosphere, an aura.

    colloquial · uncountable
  6. Diethyl ether (C₄H₁₀O), an organic compound with a sweet odour used in the past as an anaesthetic.

    uncountable
  7. Any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups.

    countable
  8. Starting fluid.

    uncountable
Where this word comes from

Etymology tree Proto-Indo-European *h₂eydʰ-der. Proto-Hellenic *áitʰō Ancient Greek αἴθω (aíthō) ▲ Ancient Greek ᾱ̓ήρ (āḗr)influ.? Ancient Greek αἰθήρ (aithḗr)der. Latin aethērder. English ether From Middle English ēther (“the caelum aetherum of ancient cosmology in which the planets orbit; a shining, fluid substance described as a form of air or fire; air”), borrowed from Anglo-Norman ether and Middle French ether, ethere, aether, from Old French aether (“highest and purest part of the atmosphere; medium supposedly filling the upper regions of space”) (modern French éther), or directly from its etymon Latin aethēr (“highest and purest part of the atmosphere; air; heavens, sky; light of day; ethereal matter surrounding a deity”) (note also New Latin aethēr (“chemical compound analogous to diethyl ether”)), from Ancient Greek αἰθήρ (aithḗr, “purer upper air of the atmosphere; heaven, sky; theoretical medium supposed to fill unoccupied space and transmit heat and light”), from αἴθω (aíthō, “to burn, ignite; to blaze, shine”), from Proto-Indo-European *h₂eydʰ- (“to burn; fire”). The English word is cognate with Italian ether, ethera (both obsolete), etere, Middle Dutch ether (modern Dutch aether (obsolete), ether), German Äther, Ether, Portuguese éter, Spanish éter.

verb/ˈiː.θə/Received-Pronunciation/ˈi.θɚ/General-American
  1. To viciously humiliate or insult.

    slang · transitive
    The battle rapper ethered his opponent and caused him to slink away in shame.
Where this word comes from

From “Ether” (2001), a song by the American hip hop recording artist Nas (born 1973). According to Nas, the song, a diss track aimed at fellow artist Jay-Z (born 1969), was thus named because he was once told that ghosts and spirits do not like the fumes from ether (noun, sense 5), and he viewed the song as affecting Jay-Z in a similar way. The song contains the lines “I fuck with your soul like ether” and “That ether, that shit that make your soul burn slow”.

verb/ˈɛðɚ//ˈɛðə//ˈiː.θə/Received-Pronunciation/ˈi.θɚ/General-American
  1. Alternative form of edder.

    UK · alt-of · alternative · dialectal
noun/ˈiː.θə/Received-Pronunciation/ˈi.θɚ/General-American
  1. Alternative letter-case form of Ether.

    alt-of
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.