noun \ˈī-sə-ˌpleth\

Definition of ISOPLETH

:  an isoline on a graph showing the occurrence or frequency of a phenomenon as a function of two variables
:  a line on a map connecting points at which a given variable has a specified constant value
iso·pleth·ic \ˌī-sə-ˈple-thik\ adjective

Origin of ISOPLETH

International Scientific Vocabulary is- + Greek plēthos quantity; akin to Greek plēthein to be full — more at full
First Known Use: 1908


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