Filling

of Fill

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.

The woof in woven fabrics.

Prepared wort added to ale to cleanse it.

(dentistry) a dental appliance consisting of any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth; "when he yawned I could see the gold fillings in his teeth"; "an informal British term for ‘filling’ is ‘stopping’"

a food mixture used to fill pastry or sandwiches etc.