D defs.my
Entry 2 senses Webster, 1913

Mattress

/măt'-rəs/ · Mat·tress · IPA /ˈmætɹɪs/
01 n. A large pad stuffed with hair, moss, or other suitable soft material, and quilted or otherwise fastened, used as or in a bed, to support th…
  1. 1.
    A large pad stuffed with hair, moss, or other suitable soft material, and quilted or otherwise fastened, used as or in a bed, to support the human body while lying down.
  2. 2.
    A mass of interwoven brush, poles, etc., to protect a bank from being worn away by currents or waves.(Hydraulic Engin.)
Phrases & compounds
innerspring mattress — A variety of mattress{1} having springs inside to provide a flexible support; it is considered more comfortable than a stuffed mattress.