Used attributively before another noun to describe organisms or traits relating to symbiosis.
Definitions
symbiontnoun
An organism that lives in a close physical association (symbiosis) with another organism, whether the interaction is mutualistic, commensal, or parasitic.
The fungus in a lichen is a symbiont that depends on its algal partner for carbohydrates.
symbiontadjective
Relating to or characteristic of a symbiont; living in symbiosis.
Symbiont bacteria inhabit the digestive tracts of many insects.