American Heritage® Dictionary of the English Language, Fourth Edition
- n. A light firm spongy rubber made by beating air into latex and then curing it. Foam rubber has a wide range of uses including upholstery and insulation.
- n. spongy rubber; made by introducing air bubbles before vulcanization and used for cushioning or upholstery
“On a bed of foam rubber lay a pearl, a one-inch ball of platinum-coated polonium.”
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