The term BASE OF A COLUMN can be broken down into three crossword solutions: PLINTH (6 letters), SUM (3 letters), and ORLO (4 letters). A PLINTH is the base of a column, usually made of stone or brick, that supports the column and provides stability. The SUM is the total amount of the base of the column, which is typically measured in height or width. An orlo is the decorative edge of the base of the column, which is often carved or molded to add an aesthetic touch.