ultramicrobacterium

noun

A bacterium that is considerably smaller than typical bacterial cells and is 0.2 to 0.3 micrometers (200-300 nm) in diameter.

OriginEnglish bacterium ← New Latin bactērium ← Ancient Greek βακτήριον (baktḗrion) →
Scrabble 29
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Meanings

nounultramicrobacterium (plural ultramicrobacteria)

plural ultramicrobacteria

  1. biologyA bacterium that is considerably smaller than typical bacterial cells and is 0.2 to 0.3 micrometers (200-300 nm) in diameter.

Origin

  1. Proto-Indo-European*h₂el-
  2. Latinūls
  3. Latinultrā
  4. Englishultra-
  5. Proto-Indo-European*mey-der.?
  6. Ancient Greekμῑκρός (mīkrós)
  7. Ancient Greekμῑκρο- (mīkro-)
  8. Englishmicro-
  9. Ancient Greekβακτηρία (baktēría)
  10. Ancient Greekβακτήριον (baktḗrion)
  11. New Latinbactērium
  12. Englishbacterium
  13. Englishultramicrobacterium

From ultra- + micro- + bacterium.

Full word history & related roots →
Cite this entry
APA

ultramicrobacterium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/ultramicrobacterium

MLA

“ultramicrobacterium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ultramicrobacterium. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “ultramicrobacterium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/ultramicrobacterium.

Source: ultramicrobacterium on Wiktionary, CC BY-SA 4.0.