belly sweetbread

from The Collaborative International Dictionary of English v.0.48

Sweetbread \Sweet"bread`\ (sw[=e]t"br[e^]d`), n.
   1. Either the thymus gland or the pancreas, the former being
      called {neck sweetbread} or {throat sweetbread}, the
      latter {belly sweetbread}. The sweetbreads of ruminants,
      esp. of the calf, are highly esteemed as food. See
      {Pancreas}, and {Thymus}.
      [1913 Webster]

   2. (Anat.) The pancreas.
      [1913 Webster]