👉 The term "capitulum" is a Latin word that refers to a type of round, cylindrical or semicircular shape. It's used in geometry and physics to denote a plane curve that is either circular or elliptical, and can be defined as: - A closed curve which has the property that it is the locus of points equidistant from two fixed points called foci. - The most important mathematical concept in geometry, where a circle is an example of a planar curve with