Similar to a Christian or a Jewish person in several ways, so any definition given earlier of a Muslim directly applies to them too.
A Muslim is one who follows Islam, which means Peace.
You'd have to be pretty damn stupid to think that being a Muslim is about terrorism or suicide bombing, the image portrayed by the media, because if you consider the number of Muslims in the world, the world's population would have ended by now. And if Muslims were terrorists, then there would not be any Muslims in the world by now as they'd be dead. Unfortunately, common sense is lacked in several people throughout the world...
The irony is that Muslims are said to blindly follow a "prehistoric book", while those people who believe that Muslims are terrorists are blindly following the media. You're all being taken for fools!