from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The main board of a computer, usually containing the circuitry for the central processing unit, keyboard, and monitor and often having slots for accepting additional circuitry.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices
from the GNU version of the Collaborative International Dictionary of English
- n. 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 motherboard.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the main circuit board for a computer
mother + board (Wiktionary)