extensometer

noun
ex·ten·som·e·ter | \ˌek-ˌsten-ˈsä-mə-tər \

Definition of extensometer 

: an instrument for measuring minute deformations of test specimens caused by tension, compression, bending, or twisting

First Known Use of extensometer

1887, in the meaning defined above

History and Etymology for extensometer

extension + -o- + -meter

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The first known use of extensometer was in 1887

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extensometer

noun
ex·ten·som·e·ter | \ˌek-ˌsten-ˈsäm-ət-ər \

Medical Definition of extensometer 

: an instrument for measuring minute deformations (as of a test specimen) caused by tension, compression, bending, or twisting

called also strain gauge

More from Merriam-Webster on extensometer

Britannica.com: Encyclopedia article about extensometer

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