asteroid

noun
🔊/ˈæstərɔɪd/
🔊/ˈæstərɔɪd/
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  1. any one of the many small planets that go around the sun小行星Topics Spaceb2
    Oxford Collocations DictionaryAsteroid is used before these nouns:
    • impact
    See full entry
    Word Originearly 19th cent.: from Greek asteroeidēs ‘starlike’, from astēr ‘star’.