Sweetbread is the thymus or pancreas of an animal, often used for food.
Sweetbread is a kind of food that some people like to eat, but others might not like it.
Examples:
The chef cooked the sweetbread for dinner.
I don't want to eat sweetbread.
Sweetbread is a kind of meat.
The sweetbread looks strange, but it tastes good.
In some places, people eat sweetbread all the time.
The sweetbread was the best part of the meal.