eurythermal Syllabification: (eu·ry·ther·mal)Pronunciation: /ˌyo͝orəˈTHərməl/ (also eurythermic /-ˈTHərmik/)Definition of eurythermal adjective Ecology (of an organism) able to tolerate a wide range of temperatures. Often contrasted with stenothermal.eurythermal in other Oxford dictionaries Definition of eurythermal in the British & World English dictionary