Bartleby
http://concise.britannica.com/
http://www.bartleby.com/reference/
Britanica
Picture Dictionary
http://www.utm.edu/research/iep/
Reference.com
Rhyming Dictionaries
Smithsonian
Encyclopedia
http://www.si.edu/resource/faq/start.htm#a
Symbolism
http://www.umich.edu/~umfandsf/symbolismproject/symbolism.html/
http://www.bartleby.com/62/
(Roget’s II)
http://www.plumbdesign.com/thesaurus/ (visible
mind maps of words)
Translation
http://www.freetranslation.com/
Wikipedia