floorplate

noun4

1. •
   A (usually metal) plate used as industrial flooring.
2. •
   The structural base plate of the floors (storeys) of a building, usually made up of bottom panels, floor panels, floor slabs, paving slabs, hollow core slabs or beams or joists in timber constructions.

   • In that new building, which has large 40,000-square-foot floorplates, some of the large tenants may want to be assured of an option to grow. — 2007
3. •
   A specialized glial structure integral to the developing nervous system of vertebrate organisms.
4. •
   A horizontal, structural, load-bearing member in platform framing (wooden building framing). Also called bottom plate, sill plate, sole plate or (lower) wall plate.