Dictionaries

English language

Oxford English Dictionary
Electronic full text version of the most complete historical dictionary of the English language.  Gives citations of the first instances of word usage in English literature

Credo Reference
Search English language dictionaries

ALLwords.com
English dictionary with multi-lingual search capability.

Merriam-Webster's Dictionary

New Oxford American Dictionary
REF PE 1628 .N429 2005

Roget's Thesaurus
The online version of the well-known book of synonyms and similar words.

Other languages

Credo Reference - Bilingual Dictionaries
Search bilingual French, German, Irish, Italian, Latin, Polish, Portuguese, Spanish, and Welsh dictionaries.

Web of Online Dictionaries
An exceptional site sponsored by Bucknell University. Links to dictionaries of many diverse languages

Chinese

McGraw-Hill's Chinese Dictionary and Guide to 20,000 Essential Words
REF PL 1455 .H7957 2010

Oxford Beginner's Chinese Dictionary
REF PL 1455 .O925 2006

French

Collins French Dictionary

Oxford Hachette French Dictionary
REF PC 2640 .O83 2007

German

Collins German Dictionary

Oxford Duden German Dictionary
REF PF 3640 .O94 2005

Greek (ancient)

Greek-English Lexicon
REF PA 445 .E5 L6 1996

Italian

Collins Italian Dictionary

Oxford Paravia Italian Dictionary
REF PC 1640 .O95 2006

Japanese

Basic Japanese-English Dictionary 2d ed.
REF PL 679 .B37 2004

Latin

Collins Latin Dictionary

Cassell's Latin Dictionary
REF PA 2365 .E5 1977

Elementary Latin Dictionary
REF PA 2365.E5 L72 1997

Spanish

Collins Spanish Dictionary

Oxford Spanish Dictionary
REF PC 4640 .O948 2008

Diccionario Real Academia Espanola