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The main printed circuit board in a complex electronic device, such as a personal computer, usually containing the central processing unit, the main system memory, and other components essential to the device's operation.
(Electronics) (in an electronic system) a printed circuit board through which signals between all other boards are routed
moth•er•board(ˈmʌð ərˌbɔrd, -ˌboʊrd)
a rigid slotted board upon which other boards that contain the basic circuitry of a computer or of a computer component can be mounted.
The main circuit board of a computer, usually containing the central processing unit and main system memory as well as circuitry that controls the disk drives, keyboard, monitor, and other peripheral devices.
A circuit board into which other PCBs can be slotted.