submicroscopic

/ˌsʌbmaɪkrəˈskɑpɪk/
adjective
  1. Too small to be seen with an ordinary microscope; requiring an electron microscope to be visible.
    • Nanotechnology often deals with submicroscopic materials like carbon nanotubes.
    • The scientist studied submicroscopic structures within the cell membrane.
    • Viruses are submicroscopic particles that can only be seen with powerful electron microscopes.
  2. Extremely tiny; on a scale far smaller than what is normally observable.
    • Submicroscopic defects in the metal can lead to cracks over time.
    • The new sensor can detect submicroscopic changes in temperature.
    • The artist created submicroscopic sculptures using a focused ion beam.
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