noun
: an index cut into the fore edge of a book in the form of steps with the edge of each set of leaves preceding an indexed leaf being cut away — compare tab index , thumb index
noun
: an index cut into the fore edge of a book in the form of steps with the edge of each set of leaves preceding an indexed leaf being cut away — compare tab index , thumb index
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012