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Adjective: polycrystalline  ,pó-lee'kris-tu-lun or ,pó-lee'kris-tu,lIn [N. Amer], ,pó-lee'kris-tu,lIn [Brit]
  1. Composed of aggregates of crystals
    "polycrystalline metals"

See also: crystalline

Encyclopedia: Polycrystalline