/ Dictionary / Index S split rail: Meaning and Definition of Find definitions for: split' rail' Pronunciation: [key] a wooden rail split lengthwise from a log and commonly used in rustic rail and post fencing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. split-phase split roll Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language