Muselmann (pl. Muselmänner, the German version of Musulman, meaning Muslim) was a slang term used among captives of World War II Nazi concentration camps to refer to those suffering from a combination of starvation (known also as "hunger disease") and exhaustion and who were resigned to their impending death. The Muselmann prisoners exhibited severe emaciation and physical weakness, an apathetic listlessness regarding their own fate, and unresponsiveness to their surroundings owing to the barbaric treatment by the Nazis and prisoner functionaries.
Some scholars argue that the term possibly comes from the Muselmann's inability to stand for any time due to the loss of leg muscle, thus spending much of the time in a prone position, recalling the position of the Musulman (Muslim) during prayers.
The American psychologist David P. Boder assisted in identifying the term musselman when in 1946 he conducted interviews with camp survivors in Europe. He asked them to describe, spell and pronounce the word for camp inmates so emaciated that they had lost the will to live.
Primo Levi tried to explain the term (he also uses Musselman), in a footnote of If This Is a Man, his autobiographical account of his time in Auschwitz:
This word ‘Muselmann’, I do not know why, was used by the old ones of the camp to describe the weak, the inept, those doomed to selection.
The psychologist and Auschwitz survivor Viktor Frankl, in his book Man's Search for Meaning, provides the example of a prisoner who decides to use up his last cigarettes (used as currency in the concentration camps) in the evening because he is convinced he won't survive the Appell (roll call assembly) the next morning; his fellow captives derided him as a Muselmann. Frankl compares this to the dehumanized behavior and attitudes of the kapos.