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Definition of asteroid noun from the Oxford Advanced Learner's Dictionary

asteroid

noun

/ˈæstərɔɪd/

/ˈæstərɔɪd/

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any one of the many small planets that go around the sun
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Topics Spaceb2
Oxford Collocations Dictionary
Asteroid is used before these nouns:
impact
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Word Originearly 19th cent.: from Greek asteroeidēs ‘starlike’, from astēr ‘star’.

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See asteroid in the Oxford Advanced American Dictionary

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