Source : Free On-Line Dictionary of Computing

motherboard
     
         (mobo) The main {printed circuit board} in an
        electronic device, particularly a computer, which may contain
        sockets that accept additional boards ("daughter-boards").
     
        In a {personal computer}, the motherboard contains the {bus},
        the {microprocessor}, and {integrated circuits} used for
        controlling any built-in {peripherals} such as the {keyboard},
        text and graphics display, {serial ports} and {parallel
        ports}, {joystick}, and {mouse} {interfaces}.
     
        (2000-08-10)