isopleth

noun
iso·​pleth | \ˈī-sə-ˌpleth \

Definition of isopleth 

1 : an isoline on a graph showing the occurrence or frequency of a phenomenon as a function of two variables

2 : a line on a map connecting points at which a given variable has a specified constant value

Other Words from isopleth

isoplethic \ˌī-​sə-​ˈple-​thik \ adjective

First Known Use of isopleth

1908, in the meaning defined at sense 1

History and Etymology for isopleth

International Scientific Vocabulary is- + Greek plēthos quantity; akin to Greek plēthein to be full — more at full

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The first known use of isopleth was in 1908

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