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extensometer

[ek-sten-som-i-ter]
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noun
  1. an instrument for measuring minute degrees of expansion, contraction, or deformation.
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Origin of extensometer

First recorded in 1885–90; extens(ion) + -o- + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for extensometer

extensometer

extensimeter (ˌɛkstɛnˈsɪmɪtə)

noun
  1. an apparatus for studying small changes of length, as in the thermal expansion or mechanical compression of a solid
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012