maniac

Multiple Entries:
  maniac    -mania  

Concise Oxford English Dictionary © 2008 Oxford University Press:
maniac /ˈmeɪnɪak/

▶noun

• 1 a person exhibiting extremely wild or violent behaviour.

• 2 informal an obsessive enthusiast.

• 3 Psychiatry, archaic a person suffering from mania.

– derivatives
maniacal /məˈnʌɪək(ə)l/ adjective,
maniacally /məˈnʌɪək(ə)li/ adverb.

– origin C16: via late L. from late Gk maniakos, from mania (see mania).

Concise Oxford English Dictionary © 2008 Oxford University Press:
-mania

▶combining form Psychology

• 1 denoting a specified type of mental abnormality or obsession: kleptomania.

• 2 denoting extreme enthusiasm or admiration: Beatlemania.

– derivatives
-maniac combining form.