extensometer
noun
ex·ten·som·e·ter ˌek-ˌsten-ˈsä-mə-tər 
: an instrument for measuring minute deformations of test specimens caused by tension, compression, bending, or twisting
Word History
Etymology
extension + -o- + -meter
First Known Use
1887, in the meaning defined above
Medical Definition
extensometer
noun
ex·ten·som·e·ter ˌek-ˌsten-ˈsäm-ət-ər
: an instrument for measuring minute deformations (as of a test specimen) caused by tension, compression, bending, or twisting
called also strain gauge
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