poikilothermous

from WordNet (r) 3.0 (2006)

poikilothermous
    adj 1: of animals except birds and mammals; having body
           temperature that varies with the environment [syn:
           {poikilothermic}, {poikilothermous}, {heterothermic},
           {ectothermic}]

from The Collaborative International Dictionary of English v.0.48

Poikilothermous \Poi`ki*lo*ther"mous\ (-m[u^]s), a. (Physiol.)
   Poikilothermal.
   [1913 Webster]

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