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The Collaborative International Dictionary
Boottopping

Boottopping \Boot"top`ping\, n.

  1. (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.

  2. (Naut.) Sheathing a vessel with planking over felt.

Wiktionary
boottopping

n. 1 (context nautical English) 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. 2 (context nautical English) Sheathing a vessel with planking over felt.