[ ahy-suh-pleth ]
/ ˈaɪ səˌplɛθ /


a line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement.

Origin of isopleth

1905–10; < Greek isoplēthḗs equal in number, equivalent to iso- iso- + plêth(os) a great number + -ēs adj. suffix
Also called isarithm. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for isopleth

/ (ˈaɪsəʊˌplɛθ) /


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

Word Origin for isopleth

C20: from Greek isoplēthēs equal in number, from iso- + plēthos multitude, great number
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012