E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
O.
The fifteen O’s are fifteen prayers beginning with the letter O (See Horæ Beatissimæ Virginis Mariæ.)
1
The Christmas O’s. For nine days before Christmas (at 7 o’clock p,m.) are seven antiphones (3 syl.), each beginning with O, as O Sapientia, O Radx, etc.
x, etc.
