Initialism of blood urea nitrogen.

(of hair) Arranged in a bun.

simple past tense and past participle of bun

plural of Bun

A surname.

A bun containing currants. / (Cockney rhyming slang) The Sun (celestial body). / (Cockney rhyming slang) The Sun (British newspaper).

plural of rock bun

A bun with a coating of melted sugar on top. / Alternative name of slippery jack, a mushroom of the genus Suillus, especially Suillus luteus.

Alternative spelling of rockbun

(Canada, Nova Scotia) A jelly doughnut.