/ Dictionary / Index C crystalline: Meaning and Definition of Find definitions for: crys•tal•line Pronunciation: (kris'tl-in, -īn", -ēn"), [key] — adj. of or like crystal; clear; transparent. formed by crystallization. composed of crystals. pertaining to crystals or their formation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: crystalline (Thesaurus) crystalliferous crystalline lens Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language