Search Result for "intestinal flora":
Wordnet 3.0

NOUN (1)

1. harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning; 



WordNet (r) 3.0 (2006):

intestinal flora
    n 1: harmless microorganisms (as Escherichia coli) that inhabit
         the intestinal tract and are essential for its normal
         functioning