sheath

A usually close-fitting case or covering for a blade, as of a sword.

Any of various similar coverings.

An enveloping tubular structure, such as the base of a grass leaf that surrounds the stem or the tissue that encloses a muscle or nerve fiber.

A close-fitting dress.

A condom.

In old plows, the bar connecting the beam and sole in front: so called as sheathing the edge of the mold-board. It corresponds to the standard and in part to the shin (see shin, 8) of a modern plow. See plow, 1.

The white substance of Schwann which surrounds the axis-cylinder in a nerve-fibril.

A case or covering, especially one which fits closely: as, the sheath of a sword. Compare scabbard.

Any somewhat similar covering.