n.
An organism in a symbiotic relationship. Also called symbiote.
[Greek sumbiōn, sumbiount-, present participle of sumbioun, to live together. See symbiosis.]
symbiontic sym'bi·on'tic adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.