[sim-bee-ont, -bahy-]
noun Biology.
an organism living in a state of symbiosis.
Also, symbiote [sim-bee-oht, -bahy-] .

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

symbiontic [sim-bee-on-tik, -bahy-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
symbiont (ˈsɪmbɪˌɒnt)
an organism living in a state of symbiosis
[C19: from Greek sumbioun to live together, from bioun to live]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
symbiont (sĭm'bē-ŏnt', -bī-) or symbiote  [%PREMIUM_LINK%]     (sĭm'bē-ŏnt', -bī-)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He reckons that it is better perceived as a symbiont that is sometimes helpful and sometimes harmful.
The spirochete lives permanently as a symbiont in the patient.
Anytime a symbiont leaves a host, there is the unknown.
At some point microbes decided to become symbiont, and a symbiotic relationship evolved.
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