air mattress
noun
plural air mattresses
: a soft, airtight plastic case that is designed to be inflated and used as a bed
And take it from my early 1960s-model spine, a modern air mattress—cheap, simple to inflate and reliable—is something that many parents will find essential when sleeping in a tent.—Steve Stephens
called also air bed
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Merriam-Webster unabridged
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