Dictionaries

Wiktionary:

http://en.wikipedia.org/wiki/Wiktionary

Cambridge:

http://dictionary.cambridge.org

Merriam-Webster:

http://www.m-w.com

Columbia:

http://columbia.thefreedictionary.com

Art:

http://www.artlex.com

Computer:

http://computing-dictionary.thefreedictionary.com

http://webopedia.internet.com

http://foldoc.doc.ic.ac.uk/foldoc/index.html

Commonly confused words:

http://www.wsu.edu:8080/~brians/errors/errors.html

Dental:

http://www.braces.org/braces/dentists/glossary/index.cfm

Economics:

http://www.amosweb.com/gls

Etymology:

http://www.etymonline.com

Financial:

http://financial-dictionary.thefreedictionary.com

Idioms:

http://idioms.thefreedictionary.com

Law:

http://dictionary.law.com

http://legal-dictionary.thefreedictionary.com

Linguistics:

http://www.sil.org/linguistics/GlossaryOfLinguisticTerms

Medical abbreviations:

http://www.pharma-lexicon.com

Medicine:

http://www.merck.com/mrkshared/mmanual/sections.jsp

http://medical-dictionary.thefreedictionary.com

Music:

http://www.ericweisstein.com/encyclopedias/music

More dictionaries:

http://www.rong-chang.com/

Terms and definitions

http://www.informationsphere.com/

Dictionaries by subject:

http://www.martindalecenter.com/Language_3_English.html#ENG-GEN-SUB

Education

Knowledge Network Explorer:

http://www.kn.pacbell.com

Encyclopedias

Wikipedia:

http://en.wikipedia.org/wiki/Current_events

Encarta:

www.encarta.msn.com

Britannica:

www.britannica.com

Art:

http://artcyclopedia.com/index.html

Articles on various topics:

http://www.encyclopedia.com/

Books and knowledge:

http://encyclozine.com

Broad fields:

http://www.probertencyclopaedia.com/

CIA:

http://www.cia.gov/

Countries:

http://www.countryreports.org

Country profiles and maps:

http://www.worldatlas.com

Fiction and non-fiction:

http://www.bartleby.com

Life:

http://www.els.net

Monsters:

http://webhome.idirect.com/~donlong/monsters/monsters.htm

World Encyclopedia – countries:

http://www.emulateme.com