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Noun: poikilotherm  poy'ki-lu,thurm or 'poy-ku-low,thurm
  1. An animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals
    - ectotherm

Derived forms: poikilotherms

Type of: animal, animate being, beast, brute, creature, fauna

Encyclopedia: Poikilotherm