i ‧ so ‧ therm /ˈaɪsəθɜːm $ -ɜːrm/ BrE AmE 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
i ‧ so ‧ therm /ˈaɪsəθɜːm $ -ɜːrm/ BrE AmE 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
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012