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Adjective: ultramicroscopic  ,úl-tru,mI-kru'skó-pik
  1. Too small to be seen without an ultramicroscope
    "It is one of the familiar properties of ultramicroscopic particles that some portion of any given type are electrically charged"

Encyclopedia: Ultramicroscopic

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Ultracef
ultracentrifugation
ultracentrifuge
ultraconservative
ultra-high
ultrahigh frequency
ultraism
ultramarine
ultramarine blue
ultramicroscope
ultramicroscopic
ultramodern
ultramontane
ultramontanism
ultramundane
ultranationalism
ultranationalistic
ultrarelativistic
ultrasonic
ultrasonically
ultrasonics