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Adjective: ultrarelativistic
  1. (physics) moving at very close to the speed of light; having total energy much larger than the rest mass

Encyclopedia: Ultrarelativistic

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ultramarine blue
ultramicroscope
ultramicroscopic
ultramodern
ultramodernity
ultramontane
ultramontanism
ultramundane
ultranationalism
ultranationalistic
ultrarelativistic
ultrasonic
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ultrasonic pulse analyzer
ultrasonic pulse velocity tester
ultrasonically
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ultrasound
ultrasound scanner
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