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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
ultramarine blue
ultramicroscope
ultramicroscopic
ultramodern
ultramontane
ultramontanism
ultramundane
ultranationalism
ultranationalistic
ultrarelativistic
ultrasonic
ultrasonically
ultrasonics
ultrasonography
ultrasound
Ultrasuede
ultraviolet
ultraviolet illumination
ultraviolet lamp
ultraviolet light