Of a communications or power cable, the outer covering or coverings of tough material, often plastic, that is resistant to environmental hazards such as abrasion, liquid intrusion, solar radiation, etc , and is used to protect cable component(s) such as optical fibers or metallic conductors that transport the signal or power Note: There may be more than one sheath surrounding a given cable For example, some cable designs use an inner sheath surrounded by metallic armor, over which is an outer sheath Synonym jacket
a protective covering for a knife or sword an enveloping structure or covering enclosing an animal or plant organ or part