[ 'meɪnɪak ]
■ noun
1》 a person exhibiting extremely wild or violent behaviour.
2》 informal an obsessive enthusiast.
3》 Psychiatry, archaic a person suffering from mania.
Derivatives
~al mə'nʌɪək(ə)l adjective
~ally mə'nʌɪək(ə)li adverb
Origin
C16: via late L. from late Gk maniakos , from mania (see mania ).