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2 definitions found
 for Primitive 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.
                                                    --Spenser.
        [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.
  
     Sheath of Schwann. (Anat.) See Schwann's sheath.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Primitive \Prim"i*tive\, a. [L. primitivus, fr. primus the
     first: cf. F. primitif. See Prime, a.]
     1. Of or pertaining to the beginning or origin, or to early
        times; original; primordial; primeval; first; as,
        primitive innocence; the primitive church. "Our primitive
        great sire." --Milton.
        [1913 Webster]
  
     2. Of or pertaining to a former time; old-fashioned;
        characterized by simplicity; as, a primitive style of
        dress.
        [1913 Webster]
  
     3. Original; primary; radical; not derived; as, primitive
        verb in grammar.
        [1913 Webster]
  
     Primitive axes of coordinate (Geom.), that system of axes
        to which the points of a magnitude are first referred,
        with reference to a second set or system, to which they
        are afterward referred.
  
     Primitive chord (Mus.), that chord, the lowest note of
        which is of the same literal denomination as the
        fundamental base of the harmony; -- opposed to derivative.
        --Moore (Encyc. of Music).
  
     Primitive circle (Spherical Projection), the circle cut
        from the sphere to be projected, by the primitive plane.
        
  
     Primitive colors (Paint.), primary colors. See under
        Color.
  
     Primitive Fathers (Eccl.), the acknowledged Christian
        writers who flourished before the Council of Nice, A. D.
        325. --Shipley.
  
     Primitive groove (Anat.), a depression or groove in the
        epiblast of the primitive streak. It is not connected with
        the medullary groove, which appears later and in front of
        it.
  
     Primitive plane (Spherical Projection), the plane upon
        which the projections are made, generally coinciding with
        some principal circle of the sphere, as the equator or a
        meridian.
  
     Primitive rocks (Geol.), primary rocks. See under
        Primary.
  
     Primitive sheath. (Anat.) See Neurilemma.
  
     Primitive streak or Primitive trace (Anat.), an opaque
        and thickened band where the mesoblast first appears in
        the vertebrate blastoderm.
        [1913 Webster]
  
     Syn: First; original; radical; pristine; ancient; primeval;
          antiquated; old-fashioned.
          [1913 Webster]

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