noncrystalline

adjective
non·crys·tal·line | \ˌnän-ˈkri-stə-lən \

Definition of noncrystalline 

: not composed of crystals : not crystalline noncrystalline silicone

First Known Use of noncrystalline

1851, in the meaning defined above

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The first known use of noncrystalline was in 1851

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