Maybe someone posted this already but this website is in Japanese and it's pretty good~
http://dictionary.goo.ne.jp/
Underneath the text bar, if you click 英和 (英和) you get translations from English to Japanese while 和英 (わえい) goes from Japanese to English~ (^^) 辞書のすべて(じょしょのすべて)searches all of the dictionaries areas~
Beside the search bar you want to click 辞書検索(じしょけんさく) which searches your word for you~ The other button searches the web~
I hope you find it useful!! (^^)ノシ