Definition of sheath:

part of speech: verb

To put into a scabbard or case; to protect with any exterior covering or membrane; to cover with sheets of copper, & c., as a ship's bottom.

part of speech: noun

A case for a sword or suchlike instrument; a scabbard; in bot., a petiole when it embraces the branch from which it springs, as in grasses; the wing- case of an insect.

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Among the anc. Jews, a goat on which the high priest solemnly laid the sins of the people, and which was afterwards driven into the wilderness; any person on whom the faults of another may be fixed. ...