[ sim-bee-ont, -bahy- ]
/ ˈsɪm biˌɒnt, -baɪ- /

noun Biology.

an organism living in a state of symbiosis.


Can You Remember Your Favorite Words Of The Day From March?
Even if you’re a habitué of Word of the Day, you haven’t seen our March words in these ways! Challenge yourself to our comprehensive quiz!
Question 1 of 15
What does "habitué" mean?
Also sym·bi·ote [sim-bee-oht, -bahy-] /ˈsɪm biˌoʊt, -baɪ-/.

Origin of symbiont

1885–90; < Greek symbiont- (stem of symbiṓn), present participle of symbioûn “to live together”; see symbiosis, onto-


sym·bi·on·tic [sim-bee-on-tik, -bahy-] /ˌsɪm biˈɒn tɪk, -baɪ-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for symbiont

British Dictionary definitions for symbiont

/ (ˈsɪmbɪˌɒnt) /


an organism living in a state of symbiosis

Derived forms of symbiont

symbiontic, adjectivesymbiontically, adverb

Word Origin for symbiont

C19: from Greek sumbioun to live together, from bioun to live
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

Scientific definitions for symbiont

[ sĭmbē-ŏnt′, -bī- ]
symbiote (sĭmbē-ōt′, -bī-)

An organism in a symbiotic relationship. In cases in which a distinction is made between two interacting organisms, the symbiont is the smaller of the two and is always a beneficiary in the relationship, while the larger organism is the host and may or may not derive a benefit. See also host parasite.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.