Mortuary early 14c., from Anglo-French mortuarie "gift to a parish priest from a deceased parishioner," from Medieval Latin mortuarium, noun use of neuter of Late Latin adjective mortuarius "pertaining to the dead," from Latin mortuus, pp. of mori "to die" (see mortal (adj.)). Meaning "place where bodies are kept temporarily" first recorded 1865, a euphemism for earlier English term "deadhouse."
Morgue from the French morgue, which means 'to look at solemnly, to defy'. First used to describe the inner wicket of a prison, where new prisoners were kept so that jailers and turnkeys could recognize them in the future, it took on its modern meaning in fifteenth-century Paris, being used to describe part of the Châtelet used for the storage and identification of unknown corpses.
Morgue is predominantly used in North American English, while mortuary is more common in British English, although both terms are used interchangeably. The euphemisms “Rose Cottage” and “Rainbow’s End” are sometimes used in British hospitals to enable discussion in front of patients, the latter mainly for children.
There are two types of mortuary cold chambers:
Bodies are kept between 2 °C (36 °F) and 4 °C (39 °F). While this is usually used for keeping bodies for up to several weeks, it does not prevent decomposition, which continues at a slower rate than at room temperature.
Bodies are kept at between −10 °C (14 °F) and −50 °C (−58 °F). Usually used at forensic institutes, particularly when a body has not been identified. At these temperatures the body is completely frozen and decomposition is very much reduced.