Dictionaries
Acronym Finder: An online acronym and abbreviation finder.
Art Lexicon: Definitions and acronyms relating to art.
Computer Terms: Definitions for current computer-related words.
Merriam Webster Online: Dictionary, thesaurus, Spanish-English dictionary.
Ninjawords: Absurdly fast look-up with list-making ability.
Onelook: Definitions of more than 5 million words in more than 900 online dictionaries.
Urban Dictionary: Up-to-the-minute slang.
Word Origins: Devoted to the origins of words and phrases.