Sheaths meaning : A holster for a sword; a scabbard. (by extension) Anything that has a similar shape to a scabbard that is used to hold an object that is longer than it is wide. The base of a leaf when sheathing or investing a branch or stem, as in grasses. The insulating outer cover of an electrical cable. One of the elytra of an insect. A tight-fitting dress. The foreskin of certain animals (for example, dogs and horses). A condom.