iso·​pleth ˈī-sə-ˌpleth How to pronounce isopleth (audio)
: 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
isoplethic adjective

Word History


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

First Known Use

1908, in the meaning defined at sense 1

Time Traveler
The first known use of isopleth was in 1908

Dictionary Entries Near isopleth

Cite this Entry

“Isopleth.” Dictionary, Merriam-Webster, Accessed 13 Jun. 2024.

More from Merriam-Webster on isopleth

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!