/ Dictionary / Index O Old Castile: Meaning and Definition of Find definitions for: Old' Cas•tile' Pronunciation: (ka-stēl'), [key] a region in N Spain: formerly a province. Spanish, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Old Cairo Oldcastle Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language