Definition & Meaning of "echinus"

What is an "echinus"?

An echinus is a rounded, cushion-like molding that sits at the top of a column, just below the capital. It is usually wider than the shaft of the column and can be plain or decorated with designs. The echinus helps to support the capital and adds visual interest to the overall appearance of the column. This feature is commonly found in classical architecture, where it plays an important role in the structure's aesthetic and functional design.