isotherm

/หˆaษช.sษ™สŠหŒฮธษœห(ษน)m/

IPA: /AY0 S AH0 TH ER1 M/

noun
  1. 1

    A line on a graph or chart, such as a weather map, along which all the points have the same temperature.

Source: https://en.wiktionary.org/wiki/isotherm