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ETYMOLOGY DICTIONARY:
- crystal (n.)
- O.E. cristal "clear ice, clear mineral," from O.Fr. cristal (12c., Mod.Fr. crystal), from L. crystallus "crystal, ice," from Gk. krystallos, from kryos "frost," from PIE root *kru(s)- "hard, hard outer surface" (see crust). Spelling adopted the Latin form 15c.-17c. The mineral has been so-called since Old English; it was regarded by the ancients as a sort of fossilized ice. As a shortened form of crystal-glass it dates from 1590s. As an adjective, from late 14c.
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