poly crystalline

polycrystalline

[pol-ee-kris-tl-in, -ahyn, -een]
adjective
1.
(of a rock or metal) composed of aggregates of individual crystals.
2.
having or consisting of crystals that are variously oriented.

Origin:
1920–25; poly- + crystalline

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
polycrystalline

adjective
composed of aggregates of crystals; "polycrystalline metals" 
WordNet® 3.0, © 2006 by Princeton University.
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