Etymologically
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bacteria

Etymology and origin of the English word bacteria

History Permalink
Confidence
Established
Formation
Borrowing
First attested
1847
Ultimate origin
Ancient Greek (βακτήριον)

Pronunciation

  • IPA: /bakˈtɪə̯.ri.ə/ (UK); /bækˈtɪɹ.i.ə/ (US)[1]

Etymology

It is the New Latin plural of bacterium, prompted by French bactérie (1842),[2] from Ancient Greek βακτήριον (baktḗrion, “small staff”), a diminutive of βακτηρία (baktēría, “staff, cane”) or báktron, stick,[2][3][4] so called because the first ones observed were rod-shaped.[3][4] The Greek word is from PIE *bak-, staff, also the source of Latin baculum (“walking stick”);[3] De Vaan suggests a loanword from an unidentified source.[3]

Earliest recorded meaning

Single-celled microorganisms: 1847 in Etymonline, 1847–49 in Barnhart;[3][2] MWU dates it to 1864.[5]

Semantic evolution

It was introduced as a scientific word by the German naturalist Christian Gottfried Ehrenberg in 1838.[3] Bacteria are now classed as a separate group of prokaryotic organisms lacking a nucleus.[6][7]

Timeline

  • 1838 – coined in German use.[3]
  • 1842 – French bactérie.[2]
  • 1847 – in English.[3]

Modern meaning

Noun

  1. (plural of bacterium) Single-celled microorganisms without a distinct nucleus, some of which cause disease.

Word family

  • bacterial
  • bacterially
  • bacterin
  • bacterize
  • bacteriuria
  • Eubacteria
  • archaebacteria

Usage notes

Bacteria is the plural; the singular is bacterium.[6][7] Etymonline notes that the classical plural is sometimes wrongly used as a singular.[3]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  3. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b Pearsall, Judy, ed. (1998), The New Oxford Dictionary of English, Oxford: Clarendon Press
  5. ^ Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  6. ^ a b The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin
  7. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins
Cite this entry

“Bacteria.” Etymologically, 16 Oct. 2026, etymologically.com/en/bacteria. Accessed 16 Oct. 2026.

Last edited on . ·