Is There a Built in Dictionary?

I use the HONTO app on my iPhone. Unfortunately it doesn't have the built in dictionary or the ability to, at least for the books that I downloaded and purchased on there. Mm hmm. But I think other ebook stores and apps might have that. Manga is a very different format when it comes to like text. So manga, usually you can use those like text related features which is kind of a bummer. Well, that's probably why I can't ever use them because I only read manga on the HONto app.