noun
also rere-arch ˈri(ə)|rärch
: an inner arch of an opening (as for a door or window) that differs in size or form from the external arch of the opening
noun
also rere-arch ˈri(ə)|rärch
: an inner arch of an opening (as for a door or window) that differs in size or form from the external arch of the opening
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012