/ferr"ing/ , n.
1. the act of lining, trimming, or clothing with fur: Furring this coat will take several weeks.
2. the fur used: What kind of furring would you like?
3. the formation of a coating of matter on something, as on the tongue: A heavy furring could mean a high fever.
4. Building Trades.
a. the attaching of strips of wood or the like (furring strips) to a wall or other surface, as to provide an even support for lath or to provide an air space between the wall and plasterwork.
b. material used for this purpose.
[ 1350-1400; ME; see FUR, -ING 1 ]