Offertory

Offertory, in the Roman Catholic Church a portion of the liturgy chanted at the commencement of the eucharistic service, also in the English the part of the service read during the collection of the alms at communion.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Offenbach, Jacques * Ofterdingen, Heinrich von
Œdipus
Œhlenschläger, Adam Gottlob
Oehler, Gustav
Œil-de-bœuf
Œland
Œnonë
Oersted, Hans Christian
Oesel
Offa's Dyke
Offenbach, Jacques
Offertory
Ofterdingen, Heinrich von
Ogham
Oglethorpe, James Edward
Ogowe`
O'Groat's House, John
Ogyges
Ogygia
Ohio
Ohio River
Ohm, Georg Simon