adj. & n.
--adj.
1. fiercely energetic or frenzied.
2 a supposedly possessed by an evil spirit. b of or concerning such possession.
3 of or like demons.
--n. a person possessed by an evil spirit.
Derivatives:
demoniacal adj. demoniacally adv.
Etymology: ME f. OF demoniaque f. eccl.L daemoniacus f. daemonium f. Gk daimonion dimin. of daimon: see DEMON)