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Seismograph

Adjective, Noun

seis=mo=graph

WORDNET DICTIONARY

seismograph(n = noun.artifact) Array - a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake); Array

Seismograph, n. [Gr. an earthquake + -graph.].

An apparatus for registering the shocks and undulatory motions of earthquakes. [1913 Webster]

Seismograph, n. an instrument that records the force, direction, etc., of earthquakes.

Derivative

seismographic adj. seismographical adj.

For further exploring for "Seismograph" in Webster Dictionary Online