ENGLISH-ENGLISH DICTIONARY
http://dictionary.reference.com/
http://dictionary.cambridge.org/
http://www.ldoceonline.com/
http://www.merriam-webster.com/
http://www.thefreedictionary.com/
BILINGUAL DICTIONARY
http://michaelis.uol.com.br/
SLANG AND STREET ENGLISH
http://www.urbandictionary.com/
http://onlineslangdictionary.com/
