kastoranthropy

noun /kæstəˈɹænθɹəpi/

The delusion that one is a beaver; the condition of being a werebeaver.

, 1997: The next morning he is found down-hill from his House, beside the fishing-Pond, lying among remnants of gnaw’d Shrubs, with fragments of half-eaten water-lillies protruding from his Mouth. ‘Kastoranthropy,’ Professor Voam shaking his head, ‘And haven’t I seen it do things to a man. Tragick.’ — Thomas Pynchon, Mason & Dixon