p. pr. & vb. n. - of Fill
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.
n. - The woof in woven fabrics.
n. - Prepared wort added to ale to cleanse it.