The term "annular" refers to something that is ring-shaped or circular in form. It is often used in various scientific contexts, such as describing the shape of certain celestial bodies or geological formations. For example, an annular eclipse occurs when the Moon covers the center of the Sun, leaving a ring-like appearance of the solar surface. In addition to astronomy, "annular" can describe objects in other fields, such as annular bearings in engineering, which are designed to support rotating shafts. The ring shape allows for even distribution of pressure and can enhance the performance of machinery.