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hard rubber

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hard rubber

–noun
rubber vulcanized with a large amount of sulfur, usually 25–35 percent, to render it stiff and comparatively inflexible.

Origin:
1855–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hard rubber  
n.  Ebonite.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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