共棲的,共生的
Symbiotic \Sym`bi*ot"ic\, a. [Gr. ?.] (Biol.) Pertaining to, or characterized by, or living in, a state of symbiosis. -- {Sym`bi*ot"ic*al}, a. -- {Sym`bi*ot"ic*al*ly}, adv.
symbiotic adj : used of organisms (especially of different species) living together but not necessarily in a relationship beneficial to each