planetnoun [C]uk us /ˈplæn.ɪt/
- The planet Jupiter radiates twice as much heat from inside as it receives from the Sun.
- an unmanned mission to the planet Mars
- They launched a rocket to the planet Venus.
- Environmentalists have no political axe to grind - they just want to save the planet.
- Is it too late to repair the damage we have done to our planet?