a case or covering for the blade of a sword, dagger, or the like.

any similar close-fitting covering or case.

a condom.

Biology . a closely enveloping part or structure, as in an animal or plant.

Botany . the leaf base when it forms a vertical coating surrounding the stem.

a close-fitting dress, skirt, or coat, esp. an unbelted dress with a straight drape.

Electricity . the metal covering of a cable.

Electronics .

the metal wall of a wave guide.

a space charge formed by ions near an electrode in a tube containing low-pressure gas.

the region of a space charge in a cathode-ray tube.

to sheathe.

noun

lamina , membrane , sheathing , capsule , case , coat , covering , dress , envelope , scabbard , skin , wrapper