[ en-doh-sim-bee-oh-sis, -bahy- ]
/ ˌɛn doʊˌsɪm biˈoʊ sɪs, -baɪ- /

noun Biology.

symbiosis in which one symbiont lives within the body of the other.

Origin of endosymbiosis

First recorded in 1935–40; endo- + symbiosis

OTHER WORDS FROM endosymbiosis

en·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. 2019

British Dictionary definitions for endosymbiosis

/ (ˌɛndəʊˌsɪmbɪˈəʊsɪs) /


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

Derived forms of endosymbiosis

endosymbiotic, 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