isopleth

[ ahy-suh-pleth ]
/ ˈaɪ səˌplɛθ /

noun

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.

Origin of isopleth

1905–10; < Greek isoplēthḗs equal in number, equivalent to iso- iso- + plêth(os) a great number + -ēs adj. suffix

British Dictionary definitions for isopleth

isopleth
/ (ˈaɪsəʊˌplɛθ) /

noun

a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon or phenomena Also called: isogram, isoline

Word Origin for isopleth

C20: from Greek isoplēthēs equal in number, from iso- + plēthos multitude, great number