English dictionary
cryptocrystalline
/,kr/I/pt/oU/'kr/I/st/-/l/I/n/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
adjective
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Indistinctly crystalline; -- applied to rocks and minerals, whose state of aggregation is so fine that no distinct particles are visible, even under the microscope.
Source: webster1913