#mattress  a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed
  supertype:  #pad  a usually thin flat mass of padding
  subtype:  #air_mattress  #feather_bed  #futon  #paillasse  #pallet  #spring_mattress  #tick.mattress
  part of:  #bed  a piece of furniture that provides a place to sleep; "he sat on the edge of the bed"; "the room had only a bed and chair"

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