E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Bun.
A small cake. (Irish, boinneog, Scotch, bannock.)
1
In regard to hot cross buns on Good Friday, it may be stated that the Greeks offered to Apollo, Diana, Hecate, and the Moon, cakes with horns. Such a cake was called a bous, and (it is said) never grew mouldy. The cross symbolised the four quarters of the moon.