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Noun: seismometer  sIz'mó-mi-tu(r)
  1. A measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)
    "the seismometer showed a sharp spike in response to the temblor";
    - seismograph

Derived forms: seismometers

Type of: measuring device, measuring instrument, measuring system

Encyclopedia: Seismometer