isotherm
noun/ˈaɪsəθɜːm/
/ˈaɪsəθɜːrm/
(specialist)- a line on a weather map that joins places that have the same temperature at a particular timeWord Originmid 19th cent.: from French isotherme, from Greek isos ‘equal’ + thermē ‘heat’.
Check pronunciation:
isotherm