Webster's 1828 Dictionary
MESOCOLON
n.[Gr. middle, and colon. ] In anatomy, that part of the mesentery, which, having reached the extremity of the ileum, contracts and changes its name, or that part of the mesentery to which the colon is attached.
Webster's 1913 Dictionary
MESOCOLON
Mes `o *co "lon, n. Etym: [NL. , fr. Gr. mésocôlon.] (Anat. )
Defn: The fold of peritoneum, or mesentery, attached to the colon. -- Mes `o *col "ic, a.
The Wordsmith Dictionary