Definition of asteroid Asteroid
/æˈstɚɔjˌd/ - [asteroyd] - as•ter•oid
We found 10 definitions of asteroid from 7 different sources.
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What does asteroid mean?
WordNet
NounPlural: asteroids |
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| asteroid - any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | ||
| minor planet, planetoid any of numerous small celestial bodies that move around the sun | ||
| chiron an asteroid discovered in 1977; it is unique in having an orbit lying mainly between the orbits of Saturn and Uranus | ||
Adjective |
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| asteroid - shaped like a star | ||
| star-shaped | ||
| angulate, angular having angles or an angular shape | ||
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Wiktionary 
- asteroid (Noun)
A naturally occurring solid object, which is smaller than a planet and is not a comet, that orbits a star. - asteroid (Noun)
In the Solar system, such a body that orbits within the orbit of Jupiter. - asteroid (Noun)
Any member of the taxonomic class Asteroidea; a starfish.
Webster DictionaryWebster's Unabridged Dictionary 📘
- asteroid (n.)
A starlike body; esp. one of the numerous small planets whose orbits lie between those of Mars and Jupiter; -- called also planetoids and minor planets.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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asteroid
A small, mostly rocky body orbiting the Sun.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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asteroid
as′tėr-oid, n. one of the minor planetary bodies revolving between the orbits of Mars and Jupiter.—adj. Asteroid′al. [Gr. astēr, a star, eidos, form.]
Wikipedia 
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An asteroid is like a planet, but smaller. The name "asteroid" means "like a star" in the ancient Greek language. Asteroids may look like small stars in the sky, but they really do move around the Sun, while stars only seem to move because the Earth spins. Like planets, asteroids do not make their own light. Because of this, some people think "asteroids" is not a good name, and think that the name "planetoid" ("like a planet") would be a better name.
Most asteroids are made of rock, but some are made of ice or metal. Most asteroids in our Solar System are in the asteroid belt between Mars and Jupiter.
Formation.
Asteroids are the leftover rock and other material from the formation of the Solar System. These rocks were too small to make a planet, and could not collide to form one.
Discovery.
In the 1600s, Gisuppe Piazzi discovered the first asteroid. It was named Ceres, and is the biggest object in the asteroid belt. Other asteroids, like Juno, Pallas, and Vesta were discovered later. Today, astronomers know of hundreds of thousands of asteroids, which range from fractions of a mile to 600 miles across.
Part of speech
🔤- asteroid, noun, singular of asteroids.
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