demon : Idioms & Phrases
demon-ridden
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adjective satellite as if possessed by demons
WordNet
maxwell's demon
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noun an imaginary creature that controls a small hole in a partition that divides a chamber filled with gas into two parts and allows fast molecules to move in one direction and slow molecules to move in the other direction through the hole; this would result in one part of the container becoming warmer and the other cooler, thus decreasing entropy and violating the second law of thermodynamics
WordNet
speed demon
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noun a driver who exceeds the safe speed limit
speeder.