mattress

Definitions

General English

Construction

  • A grade-level concrete slab used to support equipment, such as transformers and air conditioning units, outside a building.

Medical

  • noun the thick soft part of a bed for lying on

Real Estate

  • noun a large pad on which to sleep, usually containing springs or a soft springy filling
  • noun a slab or platform used as a foundation for a building
  • noun a metal framework inside reinforced concrete
http://www.dictionarycentral.com/definition/mattress.html