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seismograph

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seismograph/ˈsaɪzməˌgræf/
British/ˈsaɪzməˌgrɑːf/noun
pluralseismographs
seismograph
/ˈsaɪzməˌgræf/British/ˈsaɪzməˌgrɑːf/
noun
pluralseismographs
Learner's definition of SEISMOGRAPH  
[count]
: a device that measures and records the movement of the earth during an earthquake
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