忘れない辞書＆単語帳 - ディクト app for iPhone and iPad
DiQt is a dictionary and wordbook service with over 10 million answers in total that you will never forget.
With DiQts dictionary, you can automatically review the words you look up so you never forget them again.
With DiQts wordbook, you can automatically review words you once got wrong without any hassle until you remember them.
DiQt is an efficient, psychologically based dictionary and vocabulary book application for those who seriously want to improve their vocabulary.