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Definition of Cryptocrystalline
1. a. Indistinctly crystalline; -- applied to rocks and minerals, whose state of aggregation is so fine that no distinct particles are visible, even under the microscope.
Definition of Cryptocrystalline
1. Adjective. (minerology) Whose crystalline nature only becomes apparent at high levels of magnification. ¹
¹ Source: wiktionary.com
Medical Definition of Cryptocrystalline
1. Having very minute crystals. (05 Mar 2000)