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2 definitions found
 for motherboard
From The Collaborative International Dictionary of English v.0.48 :

  motherboard \moth"er*board`\ n. (Electronics)
     The board containing the main circuits of an electronic
     device, especially computers. The term is used primarily in
     microcomputer literature, where it designates the board
     containing the main expansion bus, and usually also the cpu.
     On motherboards designed with an expansion bus, often all of
     the circuits not contained on an expansion card are on the

From The Free On-line Dictionary of Computing (30 December 2018) :

  system board
      (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.

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