a line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement.
Also called isarithm.

1905–10; < Greek isoplēthḗs equal in number, equivalent to iso- iso- + plêth(os) a great number + -ēs adj. suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isopleth (ˈaɪsəʊˌplɛθ)
isogram, Also called: isoline a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon or phenomena
[C20: from Greek isoplēthēs equal in number, from iso- + plēthos multitude, great number]

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Example sentences
In order to measure the plume core size, develop an isopleth representing the contaminant specific threshold concentration.
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