isogram

[ ahy-suh-gram ]

noun

, Meteorology, Geography.

1. a line representing equality with respect to a given variable, used to relate points on maps, charts, etc.

isogram

/ ˈaɪsəʊˌɡræm /

noun

1. See isopleth
   another name for isopleth

isogram

/ ī′sə-grăm′ /

1. See isoline

Word History and Origins

Origin of isogram¹

First recorded in 1885–90; iso- + -gram ¹