Kotobank which allows you to search across 77 dictionaries at once, covering variety of fields, including encyclopedia, languages, history, business and current issues. Provided by Asahi Shinbun,
Denshi Jisho (meaning "electronic dictionary") is an online Japanese
dictionary. Find words in Japanese, Kanji, sentence or look up Kanji by radicals. "The data comes from Jim Breen's WWWJDIC project and the site is developed by me, Kim Ahlström."
"A comprehensive, illustrated dictionary with etymologies, pictographs
& definitions in English, displaying also Hiragana and Katakana,
the Kana used in Nihongo."