from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a hypothetical device that exhibits perpetual motion, especially one that does useful work with no input of energy
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
Sorry, no etymologies found.