Yahoo! Education Reference

Yahoo! Education Reference
http://education.yahoo.com/reference/

"Yahoo! Education offers a handy selection of searchable reference materials to help you find the information you need.

Look up the definition of a word in the Dictionary, find its synonym in the Thesaurus, or translate it into Spanish.

Search for facts and information in the Encyclopedia, find country and regional maps and flags in the World Factbook, and much more."

The reference tools listed on the page includes:

The American Heritage® Dictionary, Fourth Edition

The American Heritage® Spanish Dictionary, Second Edition

Roget's II: The New Thesaurus

Columbia Encyclopedia

Columbia World of Quotations

etc...