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

isotherm

noun
 
/ˈaɪsəθɜːm/
 
/ˈaɪsəθɜːrm/
(specialist)
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  1. a line on a weather map that joins places that have the same temperature at a particular time
    Word Originmid 19th cent.: from French isotherme, from Greek isos ‘equal’ + thermē ‘heat’.
See isotherm in the Oxford Advanced American Dictionary
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