energumen
Concise Oxford English Dictionary © 2008 Oxford University Press:
energumen /ˌɛnəˈgjuːmən/
▶noun archaic a person believed to be possessed by the devil or a spirit.
– origin C18: via late L. from Gk energoumenos, passive part. of energein ‘work in or upon’.
'energumen' also found in these Oxford entries:

