A tool that is similar to a coping saw but with a much deeper frame. A fret saw, like a coping saw, has a very fine (up to 32 teeth per inch), thin blade, which is kept under tension so that it cannot bend. The greater depth of the frame, however, allows the fret saw to work on larger pieces of wood... Found on http://www.daviddarling.info/encyclopedia/F/AE_fret_saw.html
A fret saw is a long, narrow-bladed saw with the blade held tightly in a U-bend used to cut ornamental work from thin wood. A fret saw is similar to, but smaller than a coping saw. Found on http://www.probertencyclopaedia.com/browse/GF.HTM