adj. Having a body temperature that varies depending on the outside temperature.
The Century Dictionary and Cyclopedia
Same as pœcilothermic.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. of animals except birds and mammals; having body temperature that varies with the environment
Word Usage
"A few of these biosigns were, like those of all Gorn castes, endothermic or poikilothermic—dependent upon external factors for the regulation of body temperature."