What does the word sweetbread mean?

Usage examples for sweetbread

  1. A portion of the sweetbread, which generally accompanies a boiled calf's head, should be given with each portion. – Martine's Hand-book of Etiquette, and Guide to True Politeness by Arthur Martine
  2. The butcher had choice, tender lamb, he said, fit to eat the next day; and as Mr. Case was impatient to make his offering to Sir Arthur, he accepted the butcher's proposal, though with such seeming reluctance, that he actually squeezed out of him, before he would complete the bargain, a bribe of a fine sweetbread. – The Parent's Assistant by Maria Edgeworth