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2017 Word of the Year

hard rubber

noun
1.
rubber vulcanized with a large amount of sulfur, usually 25–35 percent, to render it stiff and comparatively inflexible.
Origin of hard rubber
1855-1860
First recorded in 1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for hard rubber

hard rubber

noun
1.
a hard fairly inelastic material made by vulcanizing natural rubber See vulcanite
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
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