intestinal flora

World English Dictionary
intestinal flora
 
n
microorganisms that normally inhabit the lumen of the intestinal tract

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
intestinal flora

noun
harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning 
WordNet® 3.0, © 2006 by Princeton University.
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