Definition of demonic adjective from the Oxford Advanced Learner's Dictionary

 

demonic

 adjective
adjective
BrE BrE//diˈmɒnɪk//
 
; NAmE NAmE//diˈmɑːnɪk//
 
 
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connected with, or like, a demon demonic forces a demonic appearance This was a society in which demonic possession was greatly feared. Word Origin mid 17th cent.: via late Latin from Greek daimonikos, from daimōn ‘deity, genius’; also from Latin daemonium ‘lesser or evil spirit’.
See the Oxford Advanced American Dictionary entry: demonic