endosymbiont

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noun

An organism that lives within the body or cells of another organism.

OriginEnglish symbiont ← Ancient Greek ἔνδον (éndon) ← Proto-Hellenic *éndon →
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Meanings

nounendosymbiont (plural endosymbionts)

plural endosymbionts

  1. biologyAn organism that lives within the body or cells of another organism.

Origin

  1. Proto-Indo-European*h₁n̥dóm
  2. Proto-Hellenic*éndon
  3. Ancient Greekἔνδον (éndon)
  4. Englishendo-
  5. Englishsymbiont
  6. Englishendosymbiont

From endo- + symbiont.

Full word history & related roots →
Cite this entry
APA

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

MLA

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

Chicago

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

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