Erudite and wonderfully eclectic, this website is a good source of information on words both too new for the dictionary and those vanishing from it.

Free online dictionary search, translator, word of the day, crossword puzzles, word games, and vocabulary learning resources for many languages.

More than 5 million words in more than 900 online dictionaries are indexed by the OneLook® search engine. You can define, translate, and find words in the web-based dictionaries.

Urban Dictionary is a Web-based dictionary of slang words and phrases that documents the language of urban cultures and subcultures. Users are encouraged to submit new words and definitions covering every aspect of their daily lives. Submissions are regulated by volunteer editors and rated by other users. Urban Dictionary's slogan is "Define Your World".