/ Dictionary / Index A archduchy: Meaning and Definition of Find definitions for: arch•duch•y Pronunciation: (ärch'duch'ē), [key] — pl. -duch•ies. the domain of an archduke or an archduchess. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: archduchy (Thesaurus) archduchess archduke Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language