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sclerometer

[skli-rom-i-ter]
noun
  1. any instrument for determining with precision the degree of hardness of a substance, especially a mineral, as by measuring the pressure necessary to pierce or scratch it.
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Origin of sclerometer

First recorded in 1875–80; sclero- + -meter
Related formsscler·o·met·ric [skleer-uh-me-trik, skler-] /ˌsklɪər əˈmɛ trɪk, ˌsklɛr-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sclerometer

sclerometer

noun
  1. an instrument that determines the hardness of a mineral or metal by means of a diamond point
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Derived Formssclerometric (ˌsklɪərəˈmɛtrɪk), adjective
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