Bun \Bun\, Bunn \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.]

A slightly sweetened raised cake or bisquit with a glazing of sugar and milk on the top crust.

Source: Webster's Revised Unabridged Dictionary (1913)