Foam-rubber definition

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.
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Rubber that has been treated to form a firm, spongy foam, used in upholstered seats, mattresses, etc.
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Expanded latex.
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(informal) Expanded polyurethane, the padding often used in cars and furniture.
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Other Word Forms

Noun

Singular:
foam-rubber
Plural:
foam rubbers