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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Sheath n.
 1. A case for the reception of a sword, hunting knife, or other long and slender instrument; a scabbard.
    The dead knight's sword out of his sheath he drew.   --Spenser.
 2. Any sheathlike covering, organ, or part. Specifically: (a) Bot. The base of a leaf when sheathing or investing a stem or branch, as in grasses. (b) Zool. One of the elytra of an insect.
 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.
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From: WordNet (r) 2.0

 sheath knife
      n : a knife with a fixed blade that is carried in a sheath [syn:
           case knife]