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Pronunciation: poy'ki-lo-ther'mic, -mal, -mus


  1. Varying in temperature according to the temperature of the surrounding medium; denoting the so-called cold-blooded animals, such as the reptiles and amphibians, and the plants.
  2. Capable of existence and growth in media of varying temperatures.
  3. Causing a disruption of normal hypothalamic thermoregulatory function, as seen with drugs such as phenothiazines.

Synonym(s): cold-blooded, hematocryal

[poikilo- + G. therme, heat]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.