E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A small cake. (Irish, boinneog, Scotch, bannock.)
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.