/ Dictionary / Index C crystallographic axis: Meaning and Definition of Find definitions for: crys'tallograph'ic ax'is Pronunciation: [key] — Crystall. Crystall. one of the imaginary reference lines passing through the center of an ideal crystal, designated a, b, or c. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. crystallographic crystallography Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language