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soporific

adjective
🔊/ˌsɒpəˈrɪfɪk/
🔊/ˌsɑːpəˈrɪfɪk/
(formal)
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  1. making you want to go to sleep催眠的；让人瞌睡的
    • the soporific effect of the sun太阳让人昏昏欲睡的作用
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    Oxford Collocations DictionarySoporific is used with these nouns:
    • effect
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    Word Originmid 17th cent.: from Latin sopor ‘sleep’ + -ific.