isocheim Syllabification: (i·so·cheim)Pronunciation: /ˈīsəˌkīm/Definition of isocheim noun Meteorology a line on a map connecting points having the same average temperature in winter. Origin: mid 19th century: from iso- 'equal' + Greek kheima 'winter weather'isocheim in other Oxford dictionaries Definition of isocheim in the British & World English dictionary