Definition of "sweetbread"

sweetbread

/ˈswiːtbɹɛd/

noun
plural sweetbreads
1. The pancreas or thymus gland of an animal, especially a lamb or calf, as food.
  Quotations
  SWEETBREAD SANDWICH: Cook sweetbreads until tender. When cold, remove skin, chop fine, season with salt and pepper, add one cup of finely chopped celery, and a dash of mayonnaise dressing; spread on thin slices of lightly buttered white bread. Cover with another slice and garnish with an olive.
  1909, Eva Greene Fuller, The Up-To-Date Sandwich Book: 400 Ways to Make a Sandwich, page 97
  The pancreas of an animal when cooked for consumption is known as a sweetbread.
  2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), page 177