/ Dictionary / Index C Castile: Meaning and Definition of Find definitions for: Cas•tile Pronunciation: (ka-stēl'), [key] Spanish,a former kingdom comprising most of Spain. a variety of mild soap, made from olive oil and sodium hydroxide. any hard soap made from fats and oils, often partly from olive oil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: castile (Thesaurus) Castiglione Castilian Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language