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isobar

noun
🔊/ˈaɪsəbɑː(r)/
🔊/ˈaɪsəbɑːr/
(specialist)
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  1. a line on a weather map that joins places that have the same air pressure at a particular time（天气图上的）等压线
    Word Originmid 19th cent.: from Greek isobaros ‘of equal weight’, from isos ‘equal’ + baros ‘weight’.