👉 In mathematics, a conchoid (or conic section) is a curve that can be described by the equation of a plane ellipse. It is characterized by two foci, one at each focus, and a major axis parallel to the x-axis. The minor axis lies along the y-axis. A conchoid is named after the Latin word "conchus," which means "shell." Specifically, it's also known as an "elliptic conic." For example, in