arch·duch·y 
(ärch-dŭchē)
(ärch-dŭchē)n. pl. arch·duch·ies
The territory over which an archduke or an archduchess has authority.
[French archiduché, from obsolete French archeduché : arche-, arch- (from Old French; see ARCH-1) + duché, duchy (from Old French duche; see DUCHY).]
- close call
- close corporation
- closed
- closed book
- closed-captioned
- closed chain
- closed circuit
- closed-circuit
- closed corporation
- closed couplet
- closed-door
- closed-end
- closed fracture
- closed interval
- closed loop
- closed-minded
- closed-mindedness
- close door on
- closedown
- closed shop
- closed system
- closed universe
- close-fisted
- close-grained
- student union