Webster's English Dictionary

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crystalline

crys.tal.line \'kris-t*-l*n\ aj [ME cristallin, fr. MF & L; MF, fr. L 
   crystallinus, fr. Gk kryst]allinos, fr. krystallos 1: made of crystal or 
   composed of crystals  2: resembling crystal : as  2a: TRANSPARENT  2b: 
   CLEAR-CUT  3: constituting or relating to a crystal