- rubber vulcanized with a large amount of sulfur, usually 25–35 percent, to render it stiff and comparatively inflexible.
Origin of hard rubber
First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for hard rubber
His hand clutched 12the hard-rubber receiver with white strength.
His hand reached upward and lifted the hard-rubber receiver from the hook.
He took one step forward as Loris swished across the sitting-room, lifted the hard-rubber receiver and voiced a soft, “Hello!”
We have, then, a glass or hard-rubber jar containing two lead plates and a solution consisting of water and sulphuric acid.ABC of Electricity
William Henry Meadowcroft
The touch key ended in a hard-rubber knob which could be brought in contact with the skin of the subject.
- a hard fairly inelastic material made by vulcanizing natural rubberSee 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