Doubling planks on a ship. Also, a furring in the ship's frame.
♦ Furring the boilers, in a steamer, cleaning off the incrustation or sediment which forms on their inner surfaces.
·vt The strips thus laid on. II. Furring ·vt Double planking of a ship's side. III. Furring ·p.pr....
Webster's Dictionary of the English Language