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BNC: 27158 COCA: 22809

gypsum

noun
/ˈdʒɪpsəm/
/ˈdʒɪpsəm/
[uncountable]
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  1. a soft white mineral like chalk that is found naturally and is used in making plaster of Paris石膏
    Word Originlate Middle English: from Latin, from Greek gupsos.

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