Etymologically
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bacterial

This is the current revision of this entry, as edited by bogdan on 24 October 2026 at 18:44. This address is a permanent link to this version.
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Pronunciation

  • UK: /bækˈtɪəɹiəl/[1]
  • US: /bækˈtɪɹ.i.əl/[1]

Etymology

It is formed from English bacterium + -al,[2][3][4] or from bacteria and -al;[5] Merriam-Webster treats it as an international scientific formation from bacteri- and -al.[6] bacterium is from Ancient Greek βακτήριον (baktḗrion, “small staff”),[2][7][5] a diminutive of βάκτρον (báktron, “stick, staff”).[2][5][4] The scientific word was introduced in 1838 by the German naturalist Christian Gottfried Ehrenberg,[5][4] because the first bacteria seen were rod-shaped.[5] The Greek word is traced to Proto-Indo-European *bak- (“staff”), which is also the source of Latin baculum (“rod, staff”).[5][4][7]

Earliest recorded meaning

Of or relating to bacteria: 1869, according to Etymonline and Merriam-Webster.[5][6] The OED's first quotation, from Tyndall's Fragments of Science (1879), also covers the sense "caused by bacteria".[2]

Semantic evolution

The adjective followed the English use of bacteria, recorded from 1847, by about twenty years.[5] Besides "of bacteria", it soon meant "caused by bacteria", and Merriam-Webster also gives "consisting of bacteria".[2][3][6]

Timeline

  • 1838 – the Modern Latin word bacterium is introduced by Ehrenberg.[5][4]
  • 1847 – bacteria in English.[5]
  • 1869 – bacterial, of bacteria.[5][6]
  • 1879 – first OED quotation, also in the sense caused by bacteria.[2]

Modern meaning

Adjective

  1. Of, relating to or belonging to bacteria.
  2. Caused by bacteria: a bacterial infection of the throat.
  3. Consisting of bacteria.

Word family

  • bacterially
  • abacterial
  • antibacterial
  • nonbacterial
  • bacterio-
  • bacterium
  • bacteriology
  • bacillus

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  4. ^ a b c d e Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  5. ^ a b c d e f g h i j k Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt