cryptocrystalline

adjective
cryp·to·crys·tal·line | \ˌkrip-tō-ˈkri-stə-lən \

Definition of cryptocrystalline 

: having a crystalline structure so fine that no distinct particles are recognizable under a microscope cryptocrystalline quartz

First Known Use of cryptocrystalline

1862, in the meaning defined above

History and Etymology for cryptocrystalline

crypto- + crystalline

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The first known use of cryptocrystalline was in 1862

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More Definitions for cryptocrystalline

cryptocrystalline

adjective
cryp·to·crys·tal·line | \ˌkrip-tō-ˈkris-tə-lən \

Medical Definition of cryptocrystalline 

: having a crystalline structure so fine that no distinct particles are recognizable under the microscope

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