Merriam-Webster Dictionary
www.m-w.com-any word will be explained and defined

Online Dictionary
www.online-dictionary.net

OneLook Dictionary
www.onelook.com -searches various dictionary websites for words and phrases

iTools Language Tools
www.itools.com/lang -is a thesaurus, dictionary, word unscrambler, web directory and huge search engine.

Mega-dictionary

www.lii.org/search/file/dictionaries -a dictionary directory