n.
Pronunciation: ' ī -s ə - ˌ pleth
Function: noun
Etymology: International Scientific Vocabulary is- + Greek pl ē thos quantity; akin to Greek pl ē thein to be full ― more at FULL
Date: 1908
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
– iso · pleth · ic \ ˌ ī -s ə - ' ple-thik \ adjective