Breadcrumb Home > Dictionary > Index C cryptocrystalline: Meaning and Definition of Find definitions for: cryp•to•crys•tal•line Pronunciation: (krip"tō-kris'tl-in, -īn"), [key] — adj. Mineral. having a microscopic crystalline structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cryptococcus cryptogam ✖ Related Content Daily Word Quiz: musth Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language