Meaning of “bun” - Learner’s Dictionary

bun

noun [ C ] uk us /bʌn/
CAKE UK

B2 a small, round cake:

an iced bun
BREAD

B2 a small, round piece of bread:

HAIR

a hairstyle in which the hair is arranged in a small, round shape on the back of the head

(Definition of “bun” from the Cambridge Learner’s Dictionary © Cambridge University Press)