= D =
dirty power n.
Electrical mains voltage that is unfriendly
to the delicate innards of computers. Spikes, drop-outs,
average voltage significantly higher or lower than nominal, or just
plain noise can all cause problems of varying subtlety and severity
(these are collectively known as power hits).
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.