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seismograph (n.)

"instrument for measuring the motions of an earthquake," 1858, from seismo- + -graph. Based on Italian sismografo, coined and invented by Luigi Palmieri (1807-1896), director of meteorological observation on Mount Vesuvius. Related: Seismographic; seismography (1865).

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Definitions of seismograph from WordNet

seismograph (n.)
a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake);
From wordnet.princeton.edu