IPA: //ˈaɪsəˌkaɪm//
KK: /aɪsəˈkaɪm/
A line on a map that connects places with the same average temperature during winter.
The isocheim shows the areas that experience similar winter temperatures.
Isocheim is derived from the Greek roots "iso-" (meaning equal) and "cheim" (meaning winter or cold). The term refers to a line on a map connecting points that experience the same temperature during winter, thus indicating equal coldness.
Think of 'equal' ('iso-') temperatures in 'winter' ('cheim') — that's how isocheim relates to areas experiencing the same cold.