- a casing of strong fabric filled with cotton, hair, foam rubber, etc., usually containing coiled springs, often quilted or tufted at intervals, and used on or as a bed
- an inflatable pad used in the same wayin full air mattress
- that part of a water bed that contains the water, providing cushioned support
- a mass or mat of interwoven brushwood, poles, etc. used to protect an embankment or dike from erosion, etc.
Origin of mattressMiddle English materas from Old French from Italian materasso from Arabic ma?ra?, place where something is thrown or laid, cushion