Word:

perpetual motion machine

Noun1.perpetual motion machineperpetual motion machine - a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
machine
Browse
Perpendicularity
Perpendicularly
Perpension
Perpensity
Perpent stone
Perpession
Perpetrable
Perpetrate
Perpetration
Perpetrator
Perpetua lex est
Perpetuable
Perpetual
Perpetual calendar
Perpetual curacy
perpetual motion
-- perpetual motion machine --
Perpetual screw
perpetual warrant
Perpetually
Perpetualty
Perpetuate
Perpetuating testimony
Perpetuation
Perpetuities are odious in law and equity
Perpetuity
perphenazine
Perplex
Perplexed
perplexedly
Perplexing
Perplexity
Perplexiveness
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