Phrase Finder 1,800 English idioms, phrases and expressions, with their meanings and origins explained.
Merriam-Webster's Collegiate Dictionary, Tenth Ed. Allows regular and wildcard searching, so you can find all the words ending in a given suffix.
Your dictionary.com (A Web of Online Dictionaries) It provides links to more than 400 dictionaries in more than 130 different languages.
Dictionary.com Dictionary.com is a free online dictionary, thesaurus, translator, word of the day, crossword puzzles and word games, and vocabulary learning resources for many languages.
Webster Thesaurus It is an online version of the Merriam-Webster Thesaurus.
Thesaurus.com It is an online version of Roget's Thesaurus of English words and phrases.