maniac

[ mey-nee-ak ]
/ ˈmeɪ niˌæk /

noun

a raving or violently insane person; lunatic.
any intemperate or overly zealous or enthusiastic person: a maniac when it comes to details.

adjective

Origin of maniac

First recorded in 1595–1605, maniac is from the Medieval Latin word maniacus of, pertaining to madness. See mania, -ac
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for maniac

maniac

/ (ˈmeɪnɪˌæk) /

noun

a wild disorderly person
a person who has a great craving or enthusiasm for somethinga football maniac
psychiatry obsolete a person afflicted with mania

Word Origin for maniac

C17: from Late Latin maniacus belonging to madness, from Greek
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for maniac

maniac

[ mānē-ăk′ ]

n.

An insane person.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.