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endosymbiosis

[en-doh-sim-bee-oh-sis, -bahy-]
noun Biology.
  1. symbiosis in which one symbiont lives within the body of the other.
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Origin of endosymbiosis

First recorded in 1935–40; endo- + symbiosis
Related formsen·do·sym·bi·ot·ic [en-doh-sim-bee-ot-ik, -bahy-] /ˌɛn doʊˌsɪm biˈɒt ɪk, -baɪ-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for endosymbiosis

endosymbiosis

noun
  1. a type of symbiosis in which one organism lives inside the other, the two typically behaving as a single organism. It is believed to be the means by which such organelles as mitochondria and chloroplasts arose within eukaryotic cells
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Derived Formsendosymbiotic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012