What does the word mattress mean?

Usage examples for mattress

  1. The first object which caught my attention was a youthful Russian soldier, almost a child, lying on a straw mattress, smiling as if asleep. – The Log of a Noncombatant by Horace Green
  2. March had lain down on the bare mattress and, with his cheek on a pillow, was smiling in mild amusement at Fair's account of a brief talk he had had with Leggett while the train waited at Pulaski City. – John March, Southerner by George W. Cable
  3. Then he retired to the flock mattress in the corner of the room and called Cake to bring the candle. – O. Henry Memorial Award Prize Stories of 1921 by Various