Dauer

Dauer is the German word for persistence or long-lived.

Dauer larva
Wikipedia uses the words "endurance", "duration" or "permanent" and describes an alternative developmental stage of nematode worms, particularly Caenorhabditis elegans, whereby the larva goes into a type of stasis and can survive harsh conditions.

Used in relation to Chronic Fatigue Syndrome
Dauer, or hibernation, was used to explain Chronic Fatigue Syndrome in Proceedings of the National Academy of Sciences of the United States of America (PNAS) in the paper Metabolic features of chronic fatigue syndrome.