haematocryal in British English
or US hematocryal (ˌhɛmətəʊˈkraɪəl, ˌhiː-)
adjective zoology another word for poikilothermic
poikilothermic in British English
(ˌpɔɪkɪləʊˈθɜːmɪk) or poikilothermal (ˌpɔɪkɪləʊˈθɜːməl)
adjective(of all animals except birds and mammals) having a body temperature that varies with the temperature of the surroundings
Compare homoiothermic Derived forms
poikilothermism (ˌpoikiloˈthermism) or poikilothermy (ˌpoikiloˈthermy) noun
Word origin
C19: from Greek
poikilos various +
thermal