Dictionaries on-line
Dictionary.com (http://www.dictionary.com/)
A Web of On-line Dictionary (http://www.facstaff.bucknell.edu/rbeard/diction.html)
Jim Breen’s WWWJDIC (http://www.dgs.monash.edu.au/~jwb/wwwjdic.html)
英辞郎on the web (http://www.alc.co.jp/dic/)