The Collaborative International Dictionary
belly sweetbread
Sweetbread \Sweet"bread`\ (sw[=e]t"br[e^]d`), n.
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.
(Anat.) The pancreas.