system unit

Computing Dictionary

system unit definition

The main body of a computer, consisting of a plastic or metal enclosure, the motherboard, and (typically) internal disk drives, a power supply, cooling fans, and whatever circuit boards plugged into the mother board, such as a video card.
The system unit is occasionally referred to as the CPU, though this really means central processing unit.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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