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Oxford English Dictionary*

Duden
(standard German dictionary)

Das Deutsche Wörterbuch von Jacob und Wilhelm Grimm
(largest and most detailed German dictionary — published 1838-1961, currently being revised — online project of the University of Trier, the Berlin-Brandenburgische Academy of Science and the Deutsche Forschungsgemeinschaft)

Perseus Greek & Latin Dictionary
(includes links to relevant passages in classical authors)

LEO
(German-English/English-German dictionary)