Definition of bun noun from the Oxford Advanced Learner's Dictionary

     

    bun

     noun
    noun
    BrE BrE//bʌn//
     
    ; NAmE NAmE//bʌn//
     
    Describing hair, Sweets and desserts
     
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  1. 1 [countable] a small round sweet cake an iced bun see also hot cross bun See related entries: Sweets and desserts
  2. 2 [countable] a small round flat bread roll a hamburger bun compare roll
  3. 3[countable] 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. She pulled her hair back into a messy bun. a woman with her hair in a loose bun See related entries: Describing hair
  4. 4buns [plural] (slang, especially North American English) the two sides of a person’s bottom
  5. Word Origin late Middle English: of unknown origin.Idioms (informal, humorous) to be pregnant
See the Oxford Advanced American Dictionary entry: bun