Dictionaries
- Visionary - a dictionary for terminology of human and animal vision
- MedlinePlus: Medical Dictionary (NLM)
- Online Medical and Science Dictionaries (MedBioWorld)
- The American Heritage Dictionary of the English Language
- Dictionary.com - with links to other reference
- Free Online Dictionary - Word of the Day, and other reference
- Merriam-Webster OnLine - choose Dictionary search
- OneLook Dictionary Search - includes translations
- yourDictionary.com - portal to dictionaries in numerous languages
Thesauri
- The American Heritage Book of English Usage - guide to contemporary English
- Merriam-Webster OnLine - choose Thesaurus search
- Roget's II: The New Thesaurus - hyperlinked category index
- Thesaurus.com - with links to other reference
Encyclopedias and Almanacs
- MedlinePlus: Medical Encyclopedia (NLM)
- Columbia Encyclopedia - hypertext cross-references
- Infoplease - almanacs, atlases, dictionaries...
Reference Sources
- MedicalStudent.com - a digital library for all students of medicine
- Refdesk - an indispensable site with a facts searchdesk
- Reference.com - and links to other resources
- 411.com - Online Directory Assistance
- SuperPages - Yellow Pages & White Pages
- MapQuest.Com - Maps, Directions and More
- Bartlett's Familiar Quotations - the classic quotations source
- Robert's Rules of Order - the classic meetings source