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estuary

noun
🔊/ˈestʃuəri/
🔊/ˈestʃueri/
(plural estuaries)
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  1. the wide part of a river where it flows into the sea（江河入海的）河口，河口湾
    • the Thames estuary泰晤士河河口
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    Topics Geographyc1
    Word Originmid 16th cent. (denoting a tidal inlet of any size): from Latin aestuarium ‘tidal part of a shore’, from aestus ‘tide’.