boottopping

from The Century Dictionary.

• noun Nautical: The operation of painting that part of a ship's copper which is above the water-line.
• noun The process of removing grass, slime, etc., from the side of a ship, and daubing it over with a mixture of tallow, sulphur, and resin.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Naut.) The act or process of daubing a vessel's bottom near the surface of the water with a mixture of tallow, sulphur, and resin, as a temporary protection against worms, after the slime, shells, etc., have been scraped off.
• noun (Naut.) Sheathing a vessel with planking over felt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun nautical The act or process of daubing a vessel's bottom near the surface of the water with a mixture of tallow, sulphur, and resin, as a temporary protection against worms, after the slime, shells, etc., have been scraped off.
• noun nautical Sheathing a vessel with planking over felt.