1. [adj]  consisting of or containing or of the nature of crystals; "granite is crystalline"
2. [adj]  transmitting light; able to be seen through with clarity; "the cold crystalline water of melted snow"; "crystal clear skies"; "could see the sand on the bottom of the limpid pool"; "lucid air"; "a pellucid brook"; "transparent cristal"
3. [adj]  distinctly or sharply outlined; "crystalline sharpness of outline"- John Buchan

Crystal Line
If Killashandra gives up the addictive Black Crystal, she will awaken the painful memories of the person she once was.

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1. \Crys"tal*line\ (kr?s"tal-l?n or -l?n; 277), a. [L.
   crystallinus, from Gr. ????: cf. F. cristallin. See
   {Crystal}.]
   1. Consisting, or made, of crystal.
            Mount, eagle, to my palace crystalline. --Shak.
   2. Formed by crystallization; like crystal in texture.
            Their crystalline structure.          --Whewell.
   3. Imperfectly crystallized; as, granite is only crystalline,
      while quartz crystal is perfectly crystallized.
   4. Fig.: Resembling crystal; pure; transparent; pellucid.
      ``The crystalline sky.'' --Milton.
   {Crystalline heavens}, or {Crystalline spheres}, in the
      Ptolemaic system of astronomy, two transparent spheres
      imagined to exist between the region of the fixed stars
      and the primum mobile (or outer circle of the heavens,
      which by its motion was supposed to carry round all those
      within it), in order to explain certain movements of the
      heavenly bodies.
   {Crystalline lens} (Anat.), the capsular lenslike body in the
      eye, serving to focus the rays of light. It consists of
      rodlike cells derived from the external embryonic
      epithelium.
   

2. \Crys"tal*line\, n.
   1. A crystalline substance.
   2. See {Aniline}. [Obs.]