Top Definition
It is another name for as what we call as "fever". It is the inability of the body most especially of our hypotalamus to regulate our body temperature. Thus, our body gives off too much heat.

The hypotalamus is a part in the brain which is resposible for regulating our body temperature. It is called as a thermoregulatory organ in the brain.
Son: Mommy, based on my findings, I believe that I am currently experiencing hyperpyrexia.
Mom: My God, son! You ae really experiencing an intermittent hyperpyrexia! I'll call a doctor.
by jmagalona November 15, 2007
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