Dictionaries

English Language Dictionaries

Oxford English Dictionary
Provides etymological histories.

Merriam-Webster Online
Online version of Merriam-Webster Collegiate Dictionary and Thesaurus.

Bartlett’s Familiar Quotations
An online version of the 10th edition of Bartlett's Familiar Quotations, published in 1919. Includes historical familiar quotations with reference to their origins Also offers an index to authors and keywords

Internet Acronym Server

Roget’s II: the New Thesaurus

Thesaurus.com
A general thesaurus with the ability to perform category searches.

Yourdictionary.com