Definition of "polycrystalline" [polycrystalline]

• Composed of an aggregate of very small crystals in random orientations (adjective)

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• "The other thing is the basic technology, it's called polycrystalline silicon; and although there are competitive methodologies for making solar cells, namely thin film and various types of mirrors that rotate and track or concentrate sunlight, it still looks like the poly is the material of choice because it's so mature with about 65\% of the total solar market."
• "This is especially the case with downstream tools such as polycrystalline diamond drills, which cost between GBP800 and GBP1600 depending on the version chosen."
• "The main raw material in a solar cell, polycrystalline silicon, is made in the U.S. and exported to China."