Source : Webster's Revised Unabridged Dictionary (1913)

Mesocolon \Mes`o*co"lon\, n. [NL., fr. Gr. ?; me`sos middle + ?
   the colon : cf. F. m['e]soc[^o]lon.] (Anat.)
   The fold of peritoneum, or mesentery, attached to the colon.
   -- {Mes`o*col"ic}, a.

Source : WordNet®

mesocolon
     n : mesentery that holds the lower colon the back abdominal wall