/ˌæd ˈɪn/

Definitions of add-in
  1. noun
    a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities
    synonyms: board, card, circuit board, circuit card, plug-in
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    CPU board, mother board
    the main circuit board for a computer
    PC board
    a removable circuit board for a personal computer; fits into a slot in the mother board
    type of:
    printed circuit
    computer circuit consisting of an electronic sub-assembly; copper conductors are laminated on an insulating board or card and circuit components are inserted into holes and dip soldered
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