I. di-ˈmō-nē-ˌak adjective
also de·mo·ni·a·cal ˌdē-mə-ˈnī-ə-kəl
Etymology: Middle English demoniak, from Late Latin daemoniacus, from Greek daimoniakos, from daimon-, daimōn
Date: 14th century
1. : possessed or influenced by a demon
2. : demonic
demoniac rage
• de·mo·ni·a·cal·ly ˌdē-mə-ˈnī-ə-k(ə-)lē adverb
II. noun
Date: 14th century
: one possessed by a demon