noun plural
: continuous stairs that turn or wind about a central wellhole which has rounded corners or is circular or elliptical and that have the strings and rails arranged upon geometric principles and running continuously from top to bottom
noun plural
: continuous stairs that turn or wind about a central wellhole which has rounded corners or is circular or elliptical and that have the strings and rails arranged upon geometric principles and running continuously from top to bottom
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012