Definition of extensometer in English:
 extensometer
noun ˌɛkstɛnˈsɒmɪtəɪkˌstɛnˈsɑmədər
An instrument for measuring the deformation of a material under stress.
 Example sentencesExamples
-  With such extensometer, the fiber's central zone is stretched without any displacement and can be analyzed by x-ray diffraction without moving the beam.
 -  Column covers are fitted with T-slots to allow compatibility with various accessories, such as grips, fixtures, extensometers, and chambers.
 -  Instrumentation and monitoring within the tunnels will be effected through such means as inclinometers, extensometers, strain gauges, load cells, instrumented rock bolts, and standard convergence and deformation measurements.
 -  Testing is carried out using a constant cross head speed, and elongation to fracture measured with a 50-mm gage length extensometer.
 -  Expansin activity was assayed as described earlier using a custom made extensometer.
 
Origin
  
Late 19th century: from Latin extens- 'extended' (from the verb extendere) + -meter.
   Definition of extensometer in US English:
 extensometer
nounikˌstenˈsämədərɪkˌstɛnˈsɑmədər
An instrument for measuring the deformation of a material under stress.
 Example sentencesExamples
-  With such extensometer, the fiber's central zone is stretched without any displacement and can be analyzed by x-ray diffraction without moving the beam.
 -  Expansin activity was assayed as described earlier using a custom made extensometer.
 -  Testing is carried out using a constant cross head speed, and elongation to fracture measured with a 50-mm gage length extensometer.
 -  Instrumentation and monitoring within the tunnels will be effected through such means as inclinometers, extensometers, strain gauges, load cells, instrumented rock bolts, and standard convergence and deformation measurements.
 -  Column covers are fitted with T-slots to allow compatibility with various accessories, such as grips, fixtures, extensometers, and chambers.
 
Origin
  
Late 19th century: from Latin extens- ‘extended’ (from the verb extendere) + -meter.