Definition of seismograph noun from the Oxford Advanced Learner's Dictionary

 

seismograph

 noun
noun
BrE BrE//ˈsaɪzməɡrɑːf//
 
; NAmE NAmE//ˈsaɪzməɡræf//
 
 
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an instrument that measures and records information about earthquakes
See the Oxford Advanced American Dictionary entry: seismograph