'Primitive sheath' definitions:

Definition of 'Primitive sheath'

From: GCIDE
  • 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]

Definition of 'Primitive sheath'

From: GCIDE
  • 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]