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3 definitions found
 for sheath
From The Collaborative International Dictionary of English v.0.48 :

  Sheath \Sheath\, n. [OE. schethe, AS. sc[=ae][eth],
     sce['a][eth], sc[=e][eth]; akin to OS. sk[=e][eth]ia, D.
     scheede, G. scheide, OHG. sceida, Sw. skida, Dan. skede,
     Icel. skei[eth]ir, pl., and to E. shed, v.t., originally
     meaning, to separate, to part. See Shed.]
     1. A case for the reception of a sword, hunting knife, or
        other long and slender instrument; a scabbard.
        [1913 Webster]
              The dead knight's sword out of his sheath he drew.
        [1913 Webster]
     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.
            [1913 Webster]
     Medullary sheath. (Anat.) See under Medullary.
     Primitive sheath. (Anat.) See Neurilemma.
     Sheath knife, a knife with a fixed blade, carried in a
     Sheath of Schwann. (Anat.) See Schwann's sheath.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a protective covering (as for a knife or sword)
      2: an enveloping structure or covering enclosing an animal or
         plant organ or part [syn: sheath, case]
      3: a dress suitable for formal occasions [syn: cocktail dress,

From Moby Thesaurus II by Grady Ward, 1.0 :

  31 Moby Thesaurus words for "sheath":
     Leatherette, Leatheroid, case, casing, coat, cuticle, dermis,
     encasement, fell, fleece, flesh, fur, furring, hide, imitation fur,
     imitation leather, integument, jacket, leather, leather paper,
     outer layer, outer skin, pelt, peltry, rawhide, rind, sheathing,
     skin, skins, tegument, vair

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