WordWeb Online

1. Consisting of or containing or of the nature of crystals
   "granite is crystalline"
    
2. Distinctly or sharply outlined
   "crystalline sharpness of outline"
    
3. Transmitting light; able to be seen through with clarity
   "the cold crystalline water of melted snow"
   - crystal clear, limpid, lucid, pellucid, transparent

See also: clear, crystalised [Brit], crystallised [Brit], crystallized, distinct, microcrystalline, polycrystalline

Antonym: noncrystalline

Encyclopedia: Crystalline