mesocaecum

from The Collaborative International Dictionary of English v.0.48

Mesocaecum \Mes`o*cae"cum\, n. (Anat.) [NL. See {Meso-}, and
   {Caecum}.]
   The fold of peritoneum attached to the caecum. --
   {Mes`o*cae"cal}, a.
   [1913 Webster]