seismograph

from WordNet (r) 3.0 (2006)

seismograph
    n 1: a measuring instrument for detecting and measuring the
         intensity and direction and duration of movements of the
         ground (as an earthquake)

from The Collaborative International Dictionary of English v.0.48

Seismograph \Seis"mo*graph\, n. [Gr. ??? an earthquake +
   -graph.] (Physics)
   An apparatus for registering the shocks and undulatory
   motions of earthquakes.
   [1913 Webster]

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