n. The act of one who sheathes.n. That which sheathes, covers, or protects, or may be used for such purpose.n. A protection for the main deck of a whaling-vessel, as pine boards, about one inch in thickness, laid over the deck to prevent it from being cut up by the spades, being burned while trying out oil, etc.Inclosing by or as by a sheath: as, the sheathing base of a leaf; sheathing stipules, etc. See cut under sheath, 2.