asteroid
nounUK /ˈæs.tər.ɔɪd/
US /ˈæs.tə.rɔɪd/
A big rock that floats in space around the sun.
The asteroid passed safely by Earth last night.
OTHER MEANINGS
2. A small rocky body orbiting the sun, mainly found in the asteroid belt between Mars and Jupiter.
Scientists study asteroids to learn about the early solar system.
3. A starfish or similar echinoderm with a star-shaped body.
The asteroid clung to the rock in the tide pool.
4. A type of sea star with five or more arms.
We spotted a bright orange asteroid on the reef.