Webster's English Dictionary

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intestinal

in.tes.ti.nal \in-'tes-t*n-*l, -'tes(t)-n*l\ \-e-\ aj 1: of, relating to, 
   or being the intestine  2: affecting or occurring in the intestine; also : 
   living in the i ntestine - in.tes.ti.nal.ly av