foam-rubber

foam rubber

noun
a light, spongy rubber, used for mattresses, cushions, etc.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
foam rubber

noun
spongy rubber; made by introducing air bubbles before vulcanization and used for cushioning or upholstery 
WordNet® 3.0, © 2006 by Princeton University.
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