Definition of "intestinal flora" [intestinal flora]

• Harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning (noun)

WordNet. Princeton University. 2010.

• "But when the intestinal flora lacks sufficient good bacteria from a healthy whole-foods diet, or when we consume foods that can produce an allergic sensitivity in some people—as do many chemicals, artificial preservatives, and dyes—inflammation develops in the lining of the intestine."