polycrystalline

[ pol-ee-kris-tl-in, -ahyn, -een ]
/ ˌpɒl iˈkrɪs tl ɪn, -ˌaɪn, -ˌin /

adjective

(of a rock or metal) composed of aggregates of individual crystals.
having or consisting of crystals that are variously oriented.

Origin of polycrystalline

First recorded in 1920–25; poly- + crystalline