bunn, n. [Scot. bun, bunn, OE. bunne, bonne; fr. Celtic; cf. Ir. bunna, Gael. bonnach, or OF. bugne tumor, Prov. F. bugne a kind of pancake; akin to OHG. bungo bulb, MHG. bunge, Prov. E. bung heap, cluster, bunny a small swelling.].
any of a variety of slightly sweetened or plain raised cakes or bisquits, often having a glazing of sugar and milk on the top crust; as, a hot cross bun. [1913 Webster]
a type of coiffure in which the hair is gathered into a coil or knot at the top of the head. [PJC]
the buttocks. [PJC]