Used attributively for things connected with asteroids in astronomy, and more rarely to mean ‘star-shaped’.
Definitions
asteroidnoun
A small rocky or metallic body that orbits the Sun or another star, especially any of the thousands located in the asteroid belt between Mars and Jupiter.
The Dawn probe spent years studying the asteroid Vesta in the main belt.
A celestial object composed of metal and rock that can sometimes collide with planets, including Earth.
Scientists are tracking an asteroid that is predicted to pass close to Earth next month.
asteroidadjective
Relating to or characteristic of asteroids (small rocky bodies orbiting a star).
Asteroid mining companies hope to extract platinum-group metals in space.
Having a star-like or radiating shape.
Under the microscope the pollen grains appeared asteroid.