Which of the following best defines "dwarf planet"?

The definition of a "dwarf planet" is accurately captured by the idea of a celestial body that orbits the sun and meets specific criteria established by the International Astronomical Union (IAU). A dwarf planet is similar to a regular planet in that it orbits the sun; however, it does not clear its neighboring region of other debris, which is one of the key differences that distinguishes it from a full-fledged planet.

Dwarf planets, such as Pluto and Eris, are typically spherical in shape and have not been categorized under the traditional definition of a planet due to their inability to dominate their orbital zone. This distinction is important in our understanding of the solar system's architecture and the classification of celestial bodies.

The other options do not accurately describe a dwarf planet. For example, calling it a small star or suggesting it does not orbit the sun misrepresents its fundamental characteristics. Similarly, defining it as a large moon neglects the unique classification that dwarf planets hold within the broader category of celestial objects.