A line on a map connecting points having the same amount of rainfall in a given period.
- ‘Not surprisingly, the isohyets match these vegetation zones closely, as they should.’
- ‘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.’
Late 19th century: from iso- ‘equal’ + Greek huetos ‘rain’.
We take a look at several popular, though confusing, punctuation marks.