/ Dictionary / Index T toprail: Meaning and Definition of Find definitions for: top•rail Pronunciation: (top'rāl"), [key] — n. the uppermost rail of the back of a chair or the like; a crest rail. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. top quark top round Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language