conchoids
/ˈkɑŋkɔɪdz/
noun
- A mathematical curve shaped like a shell, formed by adding a constant distance to the radius vector of a circle or other curve.
- The mathematician drew a conchoid on the board to illustrate the shell-like curve.
- The conchoid of a circle is also known as a limaçon.
- In geometry class, we learned how to construct a conchoid using a straightedge and compass.