/ Dictionary / Index C crossrail: Meaning and Definition of Find definitions for: cross•rail Pronunciation: (krôs'rāl", kros'-), [key] — n. a horizontal slat forming part of the back of a chair. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cross-question cross ratio Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language