Etymologically
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ether

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Pronunciation

  • UK: /ˈiː.θə/[1]
  • US: /ˈi.θɚ/[1]

Etymology

It is inherited from Middle English ether,[2][3] borrowed from Anglo-Norman ether, also aether,[4][5][6] and directly borrowed from Latin aethēr (“the upper, pure air; sky, heaven”),[4][5][6][7] from Ancient Greek αἰθήρ (aithḗr, “upper air; the sky”),[4][5][8] as opposed to ἀήρ (aḗr, “the lower air”).[5] The Greek noun comes from the base of αἴθω (aíthō, “to kindle, burn, shine”),[4][9][10][3] from which also αἴθρα (aíthra, “fair weather”) comes.[4][10] Hoad and Ayto relate it to Latin aestās (“summer”),[10][8] the source of aestivate,[8] and Dictionary.com to aestus (“heat”).[11] Etymonline traces it to Proto-Indo-European *aidh- (“to burn”), the source of edifice.[5] The Old French word is recorded from the 12th century,[4][5][12] and the OED compares Spanish éter, Italian etere and German Äther.[4]

Earliest recorded meaning

In ancient cosmology, an element filling all space beyond the sphere of the moon and making up the stars and planets: before 1398, in John Trevisa's translation of Bartholomaeus Anglicus' De Proprietatibus Rerum.[4][6][2]

Semantic evolution

The cosmological element was thought of as a purer form of fire or air, or as a fifth element.[5] From 1587 the word was used, chiefly in poetry, for the clear sky and the upper regions beyond the clouds;[4][13] from 1689 it was used for the refined element breathed by the gods.[4] In physics, from 1644, it named an extremely thin and elastic substance supposed to fill all space and to carry light and heat;[4][5][13] the idea was shaken by the Michelson–Morley experiment of 1887 and given up after relativity was accepted,[5] but it left the colloquial use of the ether for the medium of radio broadcasting, which Etymonline dates to 1899 and the OED to 1917.[5][4][14] The chemical sense was introduced by the chemist A. S. Frobenius in 1730 for a sweet-smelling volatile liquid made by distilling alcohol with sulphuric acid;[4][5] Barnhart explains the name by its lightness and lack of colour, which suggested air.[6][15] Its use as an anaesthetic was established by 1842.[6][5] From 1756 the name was extended to similar compounds, and since 1852 it has named the class of organic compounds in which two alkyl or aryl groups are joined by an oxygen atom.[4] Johnson (1755) gave the old senses: an element finer than air, and the matter of the highest regions above.[16] The first syllable later supplied names such as ethyl and ethane.[8] In Scottish and some English dialects ether was a form of adder.[17]

Timeline

  • before 1398 – the element filling space beyond the moon.[4][2]
  • 1587 – the clear sky, the upper regions of space.[4]
  • 1644 – physics, a substance supposed to permeate all space.[4]
  • 1689 – the refined air of heaven or of the gods.[4]
  • 1730 – chemistry, diethyl ether.[4]
  • 1756 – any of various similar volatile compounds.[4]
  • 1842 – its anaesthetic use established.[6][5]
  • 1852 – the class of organic compounds with an oxygen atom between two groups.[4]
  • 1899 – the medium of radio, according to Etymonline; 1917 in the OED.[5][4]

Meanings

Noun

  1. A colourless, volatile and highly flammable liquid, diethyl ether, made from ethanol and sulphuric acid and used as a solvent and formerly as an anaesthetic.[18][4][3]
  2. Any of a class of organic compounds in which two alkyl or aryl groups are joined by an oxygen atom.[18][4][3]
  3. the ether: the medium through which radio and television signals, and now internet data, are thought of as travelling: Her message vanished into the ether.[4][14]
  4. (chiefly literary) The clear sky; the upper regions of space.[3][4][19]
  5. (historical) The hypothetical medium once believed to fill all space and to carry electromagnetic waves.[18][3][4]
  6. (historical) In ancient cosmology, the element thought to fill the space beyond the moon and to make up the stars and planets.[3][4][19]

Word family

  • etheric
  • ethereal
  • etherize
  • ethernet
  • diether
  • etherify
  • polyether
  • diethyl ether

Usage notes

The spelling aether is a less common or archaic variant, used mainly for the older senses.[3][19][11]

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
  3. ^ a b c d e f g h Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  4. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  5. ^ a b c d e f g h i j k l m n Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  7. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  8. ^ a b c d Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
  9. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  10. ^ a b c Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  11. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  12. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
  13. ^ a b Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
  14. ^ a b Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
  15. ^ Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
  16. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
  17. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
  18. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
  19. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press