n. A book to be carried in the pocket; a note-book.n. A book worthy to be constantly used, small enough to be carried in the pocket.n. A small book or pouch, usually of flexible leather, divided into compartments, made for carrying money or memoranda in the pocketn. Pecuniary resources, especially of one person.n. A fresh-water mussel, Lampsilis capax or L. ventricosus, which has round valves of great depth.