- A protective covering, case, or enclosure, especially for a blade or blade-like object.
- A protective outer covering for a cable. Depending on the intended use for the cable, and the operational environment, it may protect against moisture, abrasion, magnetic fields, radiation, and so on. Some cables have more than one sheath. Also called cable jacket, or cable sheath.
- In a gas tube, a layer of electrons which surrounds the anode when its current is high. Also called anode sheath.
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