/ Dictionary / Index A archducal: Meaning and Definition of Find definitions for: arch•du•cal Pronunciation: (ärch'd'kul, -dy'-), [key] — adj. of or pertaining to an archduke or an archduchy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: archducal (Thesaurus) archdiocese archduchess Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language