thermanalgesia Loss of temperature sense or of the ability to distinguish between heat and cold; insensibility to heat or to temperature changes. A standard test of pain response involves applying heat to the skin, and most of us perceive pain when the skin reaches an average critical temperature of 113 degrees F (45 degrees C), and everyone, with... Found on http://www.wordinfo.info/words/index/info/view_unit/2743/17