online dictionaries

English Dictionaries and Thesauruses:
OED (Oxford English Dictionary Online), 1972- Oxford Dictionary of English (2nd edition revised)	American Heritage Dictionary of the English Language

Roget's II: The New Thesaurus The Oxford Paperback Thesaurus	The Oxford American Dictionary of Current English The Oxford American Thesaurus of Current English Visual English Dictionary

English Language Reference:
Word Histories and Mysteries Word Origins The Concise Oxford Dictionary of English Etymology	The Oxford Dictionary of American Usage and Style The American Heritage Guide to Contemporary Usage and Style How We Talk: American Regional English Today Divided by a Common Language (British and American English compared)
A New Dictionary of Eponyms Chambers Dictionary of Eponyms The American Heritage Abbreviations Dictionary	Brewer's Dictionary of Modern Phrase and Fable Brewer's Dictionary of Phrase and Fable, Millennium Edition
Dictionary of Foreign Phrases and Abbreviations, H.W. Wilson The Oxford Essential Dictionary of Foreign Terms in English The Browser's Dictionary of Foreign Words and Phrases	Dictionary of Contemporary Slang Pocket Fowler's Modern English Usage
The Oxford Dictionary of English Grammar Encyclopedia of Rhetoric	The American Heritage Dictionary of Idioms The Oxford Dictionary of Idioms
The Penguin Rhyming Dictionary Oxford Dictionary of Rhymes	The Oxford Dictionary of Proverbs
Dictionary of Languages A Dictionary of Linguistics and Phonetics International Encyclopedia of Linguistics	Rawson's Dictionary of Euphemisms and Other Doubletalk Rawson's Wicked Words The Bloomsbury Good Word Guide The Devil's Dictionary

Foreign Languages and Bilingual Dictionaries:

Oxford Language Dictionaries Online: Chinese, French, German, Italian, Russian and Spanish.
This is a fully searchable, comprehensive bilingual dictionaries online resource. In addition to dictionaries, OLDO includes unique study materials on topics such as life & culture, grammar & vocabulary, and writing & word games.
More:

Foreign Languages

Bilingual

Print Language Dictionaries:

Arabic-English PJ6640.S8	1972
Aramaic: See Hebrew
Armenian-English/English-Armenian PK8441.Y4	1960
Cambodian-English/English-Camboidan PL4326.E4
Catalan-English/English-Catalan PC329 1 .C38	1994
Chinese-English/English-Chinese PL1455.C69	1986
Czech PG4640.M6	1846
Danish-English/English-Danish PD3640.V481	1979
Dutch-English/English Dutch PF640.C375	1996
English Dictionaries PE1628
English Thesauri PE1591
Finnish-English PH279.W83	1978
French-English/English-French PC2640.O94	1994
German-English/English-German PF3640.C68	1998
Greek-English/English-Greek PAl139.E5.P77	1982
Hebrew-English PJ4833.09	1996
Hindi: See Urdu
Hungarian-English/English-Hungarian PH2640.067	1994
Irish-English PB1261.G74	1995
Italian-English-Italian PC1640.C33
Japanese-English PL679.K388	1980
Khmer: See Cambodian
Korean-English/English-Korean PL937.E5.N48	1973
Latin-English/English-Latin PA2365.E5
Lithuanian-English PG8679.A57	1967

Norwegian-English PD2691.B4	1989
Persian-English PK6379.A694	1986
Polish-English/English-Polish PG6640.K65
Portuguese-English/English-Portugese PC5333.M583	1988
Romanian-English PC779.P35	1982
Russian-English/English-Russian PG2640.K34	1984
Serbo-Croatian PG8679.A57	1967
Spanish-English/English-Spanish PC4640.R32	1995
Swahili-English PL8703.J66	1969
Swedish-English PD5640
Tibetan-English PL3637.E5.G65	1986
Turkish-English PL191.R52	1974
Urdu-Hindi-English PK1986.P4	1974
Vietnamese-English/English-Vietnamese PL4376.N359	1987
Welsh-English PB2191 .W45	1995
Yiddish-English PJ51 17.H28	1991