Maniac is defined as a person acting wild and violently, or a person who has an excessive liking for something.
(adjective)The definition of a maniac is an uncontrollably violent person or someone who is overly interested or obsessed with something.
(noun)See maniac in Webster's New World College Dictionary
adjective
Origin: ML maniacus
noun
See maniac in American Heritage Dictionary 4
noun
Origin:
Origin: From Late Latin maniacus, maniacal
Origin: , from Greek maniakos
Origin: , from maniā, madness; see men-1 in Indo-European roots
.Learn more about maniac