billfold n. A small, thin, flat container, usually made of leather or imitation leather, having a pocket of a size just large enough to hold paper currency and folded over once to fit in the pocket of one's clothing; it is a type of wallet, but having fewer compartments than the typical wallet.
... I took off my coat and hung it on the back of a chair. In the inside pocket of my coat I had my billfold containing about one hundred dollars, all the money I had, and also my valuable papers. When I went to reach for my money my billfold was gone. The saloon keeper seemed to know what had taken place and handed me five ... — Personal Experiences of S. O. Susag • S. O. Susag