free-living

[free-liv-ing]
adjective
1.
following a way of life in which one freely indulges the appetites, desires, etc.
2.
Biology. noting an organism that is neither parasitic, symbiotic, nor sessile.

Origin:
1810–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
free-living
 
adj
1.  given to ready indulgence of the appetites
2.  (of animals and plants) not parasitic; existing independently
 
free-'liver
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Mitochondria are descended from free-living bacteria, which several billion
  years ago were swallowed by complex cells.
To the authors, this suggests that the viruses are the evolutionary descendants
  of an ancient, free-living eukaryotic cell.
Stress, social status, and reproductive physiology in free-living baboons.
And then years of apprenticeship, precariously dependent on trustees amid a set
  of free-living medical students.
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