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Sheath

n.
  1. A case for the reception of a sword, hunting knife, or other long and slender instrument; a scabbard.
  2. Any sheathlike covering, organ, or part.
    3. Medullary sheath . (Anat.)
    See under Medullary.
    Primitive sheath . (Anat.)
    See Neurilemma.
    Sheath knife ,
    a knife with a fixed blade, carried in a sheath.
    Sheath of Schwann . (Anat.)
    See Schwann's sheath.