Goo Jisho
Free online dictionary for Japanese from Sanseido, based on a variety of Sanseido dictionaries. Includes new words category search, phrase examples, and cross-dictionary/website searching. For intermediate Japanese Language learners.
Online Japanese Dictionary Service
Online Japanese dictionary provided free through the Electronic Dictionary Research and Development Group. Page is edited and maintained by Jim Breen, through Monash University. Features Key-word search and Kanji search by reading, code and radical.
Perapera.org
Firefox and Google Chrome extensions that allow for a pop-up dictionary. Put your mouse over any Chinese or Japanese word, and it gives you the pronunciation and definition.
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