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Adjective: poikilothermic  ,poy-ku-low'thur-mik or ,poy-ku-lu'thur-mik
  1. (zoology) having body temperature that varies with the environment
    "All crocodilians are poikilothermic";
    - poikilothermous, heterothermic, ectothermic

See also: cold-blooded

Encyclopedia: Poikilothermic