Definition of isotherm noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈaɪsəθɜːm//
; NAmE NAmE//ˈaɪsəθɜːrm//
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a line on a weather map that joins places that have the same temperature at a particular time Word Origin mid 19th cent.: from French isotherme, from Greek isos ‘equal’ + thermē ‘heat’.
See the Oxford Advanced American Dictionary entry: isotherm