|  | 
Definition of Intestinal flora
1. Noun. Harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning. 
Medical Definition of Intestinal flora
1. 
|  | 
1. Noun. Harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning. 
1.