[chrisvasselli]

Yeah, it's definitely a weakness in Nihongo. I'd love to have a really well-integrated Japanese-Japanese dictionary, but I've never been able to find a J-J open-source database like JMDict/EDict. My solution for now is that you can tap on the menu button in the top-right of any entry, and open it in the built-in iPhone dictionary, which includes a J-J dictionary. But that's not a very satisfying answer.