taking the temperature of the surroundings
heterothermy, heterothermal 1. Having a temperature which varies with that of the surroundings, as plants and cold-blooded animals; cold-blooded. 2. The exhibition of widely different body temperatures at different times or under different conditions, as certain species of birds, marsupials, or hibernating species.heterotherm, heterothermic, heterothermal Having a temperature which varies with that of the environment; such as, plants and cold-blooded animals.