Eijirō (英辞郎?) is a very large database of English-Japanese translations. Developed by the editors of the Electronic Dictionary Project and aimed at translators, Eijirō is currently one of the most popular dictionaries on the Internet. Although the contents are technically the same, EDP refers to the accompanying Japanese-English database as Waeijirō (和英辞郎?).
Read more about Eijirō: History, Characteristics, Access