Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

symbiotically
     adv : in a symbiotic manner