ex·ten·som·e·ter 
(ĕk′stĕn-sŏmĭ-tər)
(ĕk′stĕn-sŏmĭ-tər)n.
An instrument used to measure minute deformations in a test specimen of a material.
[EXTENS(ION) + -METER.]
- radiological
- radiologically
- radiologist
- radiology
- radiolucency
- radiolucent
- radiolysis
- radiolytic
- radioman
- radiometer
- radiometric
- radiometric dating
- radiometry
- radiomimetic
- radionuclide
- radiopacity
- radiopaque
- radiopharmaceutical
- radiophone
- radiophonic
- radiophoto
- radiophotograph
- radiophotography
- radioscopic
- radioscopical