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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

Nearest

ultraconservative
ultra-high
ultrahigh frequency
Ultraism
ultraism
ultra-lightweight concrete
ultramarathon
ultramarine
ultramarine blue
ultramicroscope
ultramicroscopic
ultramodern
ultramodernity
ultramontane
ultramontanism
ultramundane
ultranationalism
ultranationalistic
ultrarelativistic
ultrasonic
ultrasonic flaw detector