"isobront" meaning in English

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      "expansion": "Ancient Greek βροντή (brontḗ, “thunder”)",
      "name": "bor"
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  "etymology_text": "iso- + Ancient Greek βροντή (brontḗ, “thunder”) (see bronto-).",
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      "form": "isobronts",
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          "ref": "1895, Thomas Russell, Meteorology, Weather, and Methods of Forecasting, pages 119–120",
          "text": "The lines joining the points where the first thunder is heard at the same instant of time are called \"isobronts\", or lines of equal front.\nSometimes the isobront is taken as the mean of the time when first and last thunder is heard at a place. This is the custom in France.",
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        "An isoline drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously."
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        "(meteorology) An isoline drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously."
      ],
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        "meteorology",
        "natural-sciences"
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        "An isoline drawn through geographical points which, on average, experience the same number of thundery days per year."
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        "(meteorology) An isoline drawn through geographical points which, on average, experience the same number of thundery days per year."
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  "etymology_text": "iso- + Ancient Greek βροντή (brontḗ, “thunder”) (see bronto-).",
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        "(meteorology) An isoline drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously."
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      "glosses": [
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        "(meteorology) An isoline drawn through geographical points which, on average, experience the same number of thundery days per year."
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