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ballpoint

noun
🔊/ˈbɔːlpɔɪnt/
🔊/ˈbɔːlpɔɪnt/
(also ballpoint pen)
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  1. a pen with a very small metal ball at its point, that rolls ink (= coloured liquid for writing, etc.) onto the paper 圆珠笔；原子笔
    compare Biro™
    Oxford Collocations DictionaryBallpoint is used before these nouns:
    • pen
    See full entry