noun mat·tress \ˈma-trəs\

: a cloth case that is filled with material and used as a bed

Full Definition of MATTRESS

a :  a fabric case filled with resilient material (as cotton, hair, feathers, foam rubber, or an arrangement of coiled springs) used either alone as a bed or on a bedstead
b :  an inflatable airtight sack for use as a mattress
:  a device (as of interwoven brush and poles) used to protect a shoreline, bank, or streambed from erosion

Origin of MATTRESS

Middle English materas, from Anglo-French, from Medieval Latin materacium, from Arabic maṭraḥ place where something is thrown
First Known Use: 14th century


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