Oder

Oder, an important German river, rises in Moravia, and crossing the frontier flows NW. through Silesia, and N. through Brandenburg and Pomerania 550 m. into the Stettiner Haff and so to the Baltic. On its banks stand Ratibor, where navigation ends, Breslau, Frankfort, and Stettin; it receives its chief tributary, the navigable Warthe, on the right, and has canal communication with the Spree and the Elbe.

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

Oddfellows * Odessa
Ochils
Ochiltree, Edie
Ochino, Bernardino
Ochterlony, Sir David
Ockley, Simon
O'Connell, Daniel
Octavia
October
Od
Oddfellows
Oder
Odessa
Odin
Odo
Odoacer
O'Donnell, Leopold
Odyssey
Œcolampadius, Joannes
Œdipus
Œhlenschläger, Adam Gottlob
Oehler, Gustav