air mattress

noun
a mattress, usually of plastic or rubber, that can be inflated for use, as in camping, and deflated for storage.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
If you piled blocks of ice up on the air mattress, the mattress would be depressed into the water surface and float lower.
The sixth guest must bring a sleeping bag or air mattress.
He testified that one of the boys slept in the bed that he had brought in and the other slept on an air mattress.
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