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noun
A line drawn on a map connecting points having the same numerical value of some variable.
synonyms: isogram, isopleth.
is a specific kind of: line.
is a broader term that covers: isobar | isochrone | isoclinal, isoclinic line | isohel | isotherm.
Polish: izograma
Find more on isarithm elsewhere: etymology - rhymes - Wikipedia.
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