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endosymbiont

[en-doh-sim-bee-ont, -bahy-]
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noun
  1. a symbiont that lives within the body of the host.
Also en·do·sym·bi·ote [en-doh-sim-bee-oht, -bahy-] /ˌɛn doʊˈsɪm biˌoʊt, -baɪ-/.

Origin of endosymbiont

First recorded in 1935–40; endo- + symbiont
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018