American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
Elsewhere on the web
The successful transfer of a life-shortening strain of the inherited bacterial symbiont, Wolbachia, into the major mosquito vector of dengue, Aedes aegypti, halved adult life span under laboratory conditions.— CiteULike: Everyone's library
Programmed cell death in host-symbiont associations, viewed through the Gene Ontology— BioMed Central - Latest articles
It seems like it would be handy for an animal to have a photosynthetic capability, either naturally or as a symbiont.— Ask MetaFilter

American Heritage Dictionary (1)
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You can expect to see this word about once a year.
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