Noah Webster's New International Dictionary of the English Language

1. (p. pr. & vb. n.) of Fill.

2. (n.) 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.

3. (n.) The woof in woven fabrics.

4. (n.) Prepared wort added to ale to cleanse it.