- a line on a map linking places with the same mean summer temperature
Compare isocheim
WordReference Random House Unabridged Dictionary of American English © 2026
i•so•there
(ī′sə thēr′),USA pronunciation n. [Climatol.]
i•soth•er•al
(ī soth′ər əl),USA pronunciation adj.
- Meteorologya line on a weather map or chart connecting points that have the same mean summer temperature.
- Greek théros summer
- 1850–55; iso- + -there
Collins Concise English Dictionary © HarperCollins Publishers::
isothere /ˈaɪsəʊˌθɪə/ n