i‧so‧therm /ˈaɪsəθɜːm $ -ɜːrm/
noun [countable] technical[
Date: 1800-1900;
Language: French;
Origin: isotherme, from Greek iso- ( ⇒ iso-) + therme 'heat']
a line on a weather map joining places where the temperature is the same
[TahlilGaran] Dictionary of Contemporary English ▲