[sim-bee-ot-ik, -bahy-]
living in symbiosis, or having an interdependent relationship: Many people feel the relationship between humans and dogs is symbiotic.
Sometimes, symbiotical.

symbio(sis) + -tic

symbiotically, adverb
nonsymbiotic, adjective
nonsymbiotical, adjective
nonsymbiotically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
symbiosis (ˌsɪmbɪˈəʊsɪs, ˌsɪmbaɪˈəʊsɪs)
1.  a close and usually obligatory association of two organisms of different species that live together, often to their mutual benefit
2.  a similar relationship between interdependent persons or groups
[C19: via New Latin from Greek: a living together; see symbiont]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1882, in biology, from symbiosis. Of human activities, from 1951.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

symbiotic sym·bi·ot·ic (sĭm'bē-ŏt'ĭk, -bī-)
Of, resembling, or relating to symbiosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
symbiosis   (sĭm'bē-ō'sĭs)  Pronunciation Key 
The close association between two or more organisms of different species, often but not necessarily benefiting each member. The association of algae and fungi in lichens and of bacteria living in the intestines or on the skin of animals are forms of symbiosis. Some scientists believe that many multicellular organisms evolved from symbiotic relationships between unicellular ones and that the DNA-containing organelles within certain eukaryotic cells (such as mitochondria and chloroplasts) are the product of symbiotic relationships in which the participants became interdependent. There are four forms of symbiosis: amensalism, commensalism, mutualism, and parasitism.

symbiotic adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are two symbiotic things that when they work together, the purity of truth
  comes out to all who will listen.
The connecting interfaces could be some sort of symbiotic lifeform that was
  unrelated to begin with.
Drawn largely from the museum's collection, the show tracks this symbiotic
  relationship with spirit and wit.
The size of a sesame seed, the third gut contains a dense mush of symbiotic
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