motherboard

[muhth-er-bawrd, -bohrd]
noun Computers.
a rigid, slotted board upon which other boards that contain the basic circuitry of a computer or of a computer component can be mounted. Compare board ( def 14 ).

Origin:
mother1 + board

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Collins
World English Dictionary
motherboard (ˈmʌðəˌbɔːd)
 
n
(in an electronic system) a printed circuit board through which signals between all other boards are routed

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
motherboard   (mŭ'ər-bôrd')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

motherboard definition

hardware
(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)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Eventually, all these external services will be built into the television set's
  motherboard.
Here, three graphics cards are installed on one motherboard.
So you'd get these little chips, and you have to put them in the motherboard.
Not the pain of the frustrated desktop user or the stymied motherboard
  programmer, but of the commuting motorist.
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