extensometer

[ ek-sten-som-i-ter ]
/ ˌɛk stɛnˈsɒm ɪ tər /

noun

an instrument for measuring minute degrees of expansion, contraction, or deformation.
Also extensimeter.

Origin of extensometer

First recorded in 1885–90; extens(ion) + -o- + -meter

British Dictionary definitions for extensometer

extensometer

extensimeter (ˌɛkstɛnˈsɪmɪtə)

/ (ˌɛkstɛnˈsɒmɪtə) /

noun

an apparatus for studying small changes of length, as in the thermal expansion or mechanical compression of a solid