Definition of poikilothermism in English:
poikilothermism
Pronunciation /ˌpɔɪkɪlə(ʊ)ˈθəːmɪz(ə)m/
noun
Zoology Physiology
Poikilothermy. Also (Medicine): = "poikilothermia".
Origin
Early 20th century; earliest use found in Journal of Physiology. From poikilotherm- + -ism.