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accelerograph

noun ac·cel·ero·graph \ -rəˌgraf \
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Definition of accelerograph

plural -s
1 : an apparatus for measuring and recording the pressure developed by combustion of an explosive in a closed space
2 : an instrument for recording the acceleration in velocity of earthquake vibrations

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Origin and Etymology of accelerograph

borrowed from French accélérographe, from accéléro- (as in accéléromètreaccelerometer + -graphe-graph

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