wall wart: n. A small power-supply brick with integral male plug, designed to plug
directly into a wall outlet; called a ‘wart’ because when
installed on a power strip it tends to block up at least one more socket
than it uses. These are frequently associated with modems and other small
electronic devices which would become unacceptably bulky or hot if they had
power supplies on board (there are other reasons as well having to do with
the cost of UL certification).