bun - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “bun”

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bun

noun [C]  us   /bʌn/

bun noun [C] (BREAD)

a small, round piece of bread, used for a sandwich, or a small, round, sweet bread: Buy some hamburger buns for supper.

bun noun [C] (KNOT)

hair arranged into a round knot at the back of the head
(Definition of bun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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