also: エアーマット
noun
air mattress; airbed
Wasei-eigo (Japanese-made English) from 'air mat'. Refers to an inflatable mattress used for camping, guests, or as a pool float.
wasei-eigo (Japanese-coined English), from air mat
キャンプ用にエアマットを買った。
I bought an air mattress for camping.
お客さんが来るので、エアマットをふくらませた。
Since guests are coming, I inflated the air mattress.
エアベッド is closer to the English 'airbed' and often implies a taller, bed-like inflatable, while エアマット is more general and can refer to thinner camping mats or pool floats.
Wasei-eigo from English 'air' + 'mat'. The English equivalent is 'air mattress' or 'airbed'.