[poi-kuh-loh-thur-mik, poi-kil-uh-]
adjective Zoology.
cold-blooded ( def 1 ). (opposed to homoiothermal ).
Also, poikilothermal.

1880–85; < Greek poikílo(s) various + thermic

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World English Dictionary
poikilothermic or poikilothermal (ˌpɔɪkɪləʊˈθɜːmɪk, ˌpɔɪkɪləʊˈθɜːməl)
Compare homoiothermic (of all animals except birds and mammals) having a body temperature that varies with the temperature of the surroundings
[C19: from Greek poikilos various + thermal]
poikilothermal or poikilothermal
[C19: from Greek poikilos various + thermal]
poikilo'thermism or poikilothermal
poikilo'thermy or poikilothermal

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

poikilothermic poi·ki·lo·ther·mic (poi'kə-lō-thûr'mĭk) or poi·ki·lo·ther·mal (-məl) or poi·ki·lo·ther·mous (-məs)

  1. Of or relating to an organism having a body temperature that varies with the temperature of its surroundings; cold-blooded.

  2. Capable of existing and growing in media of varying temperatures.

poi'ki·lo·ther'mi·a or poi'ki·lo·ther'mism n.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
Most fish are poikilothermal animals whose body temperature follows changes in environmental temperatures rapidly and precisely.
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