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 tree, 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. Back filling.
See Back.
Source: Websters Vocabulary