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Definition: wall wart

A power adapter that contains the plug for the wall outlet. The "wart" is a derogatory reference to the device because it covers up the adjacent socket and renders it unusable. See power adapter and vampire device.

The Wart Is a Hog
Wall warts intrude into the surrounding sockets on a power strip.

The "Wall Wart" Adapter
Many power strips are built with extra space to accommodate the ubiquitous wall wart.