fur·ring 
(fûrĭng)
(fûrĭng)n.
1. Trimming or lining made of fur.
2. A furlike coating, as on the tongue.
3.
a. The preparation of a wall, ceiling, or floor with strips of wood or metal to provide a level substratum for plaster, flooring, or another surface or to create an air space.
b. Strips of material used in this process.