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A line on a map connecting points having the same amount of rainfall in a given period.‘These are rainfall isohyets (in mm) for the Maitland flood event of February 1955.’
- ‘This area belongs to the carob tree forest located in a saline depression between the annual 300-400 mm isohyets.’
- ‘Not surprisingly, the isohyets match these vegetation zones closely, as they should.’
Late 19th century from iso-‘equal’ + Greek huetos ‘rain’.
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