∞ generated and posted on 2016.11.12 ∞
Organism living in long-term, physically intimate association with another, much larger organism.
See symbiosis as well as endosymbiont, endosymbiotic theory, and serial endosymbiosis. See also commensal. Contrast free living.
Symbiotic relationships include interactions that can be separately described as commensalisms, mutualisms, and parasitisms.