/ Dictionary / Index T topcastle: Meaning and Definition of Find definitions for: top•cas•tle Pronunciation: (top'kas"ul, -kä"sul), [key] — n. a large fighting top used in medieval ships. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. top brass topcoat Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language