bun

Universal Words noun 1 [C] (BrE) a small round sweet cake: an iced bun seealsoHOTCROSSBUN 2 [C] (BrE also bap) a small round flat bread roll: a hamburger bun compareROLL 3 [C] long hair that has been twisted into a round shape and is worn on top or at the back of the head: She wore her hair in a bun. 4 (buns) [pl.] (slang, especially AmE) the two sides of a person's bottom IDIOMS have a bun in the oven (informal, humorous) to be pregnant