Filling /(?)/

Fill·ing

Filling

n.
  1. That which is used to fill a cavity or any empty space, or to supply a deficiency; as, filling for a cavity in a tooth, a depression in a roadbed, the space between exterior and interior walls of masonry, the pores of open-grained wood, the space between the outer and inner planks of a vessel, etc.
  2. The woof in woven fabrics.
  3. Prepared wort added to ale to cleanse it. (Brewing)

Phrases & Compounds
Back filling
See under Back, a.