noun

• (astronomy, dated) An asteroid of any size
• (astronomy, dated) An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
• (astronomy) A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
• (astronomy) Any planetary body, including classical planets and moons: a planetary-mass object
• (astronomy) A dwarf planet