Wall-wart meaning

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.
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(informal, humorous) A power supply which plugs directly to the mains socket, without and intervening cord, and via a cord connects to power the device it is used for.
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Origin of wall-wart

  • Referring to its unsightly protrusion from the wall socket.

    From Wiktionary