a mattress, usually of plastic or rubber, that can be inflated for use, as in camping, and deflated for storage.
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Origin of air mattress
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for air mattress
But, dear traveler, it is much simpler to take an air-mattress and a foot-pump.Tenting To-night|Mary Roberts Rinehart