assuming ambient temperature
A self-explanatory term for the change of a cadaver’s temperature to match that of its surroundings, as occurs after death.
A term which has been used as a flippant synonym for dying or dead.
Synonyms Assuming room temperature, assuming seasonal temperature
Note on usage: Whilst assuming room temperature got far more hits 339,000 on 30/10/2014, (1) it appears to be used light-heartedly (and thus unprofessionally) and (2) it is incorrect in that a body will assume the temperature where it lays, regardless of whether indoors or out, thus making assuming ambient temperature (47,300 hits) the preferred term