Definition of sheathing

• p. pr. & a. - Inclosing with a sheath; as, the sheathing leaves of grasses; the sheathing stipules of many polygonaceous plants.
• n. - That which sheathes.
• n. - The casing or covering of a ship's bottom and sides; the materials for such covering; as, copper sheathing.
• n. - The first covering of boards on the outside wall of a frame house or on a timber roof; also, the material used for covering; ceiling boards in general.