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