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[par-uh-noid] /ˈpær əˌnɔɪd/
of, like, or suffering from paranoia.
a person suffering from paranoia.
Also, paranoiac
[par-uh-noi-ak, -ik] /ˌpær əˈnɔɪ æk, -ɪk/ (Show IPA),
[par-uh-nee-ak, -ik] /ˌpær əˈni æk, -ɪk/ (Show IPA)
Origin of paranoid
1900-05; paranoi(a) + -oid, with base and suffix merged, perhaps by haplology from the expected *paranoioid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for paranoiac
Historical Examples
  • And the forty millions still alive were restless, frightened, paranoiac.

    It's All Yours Sam Merwin
  • To use a philosophical term, the paranoiac is the Simon-pure "solipsist."

    The Behavior of Crowds Everett Dean Martin
  • It clings to its fixed ideas with the same tenacity as does the paranoiac.

    The Behavior of Crowds Everett Dean Martin
  • It is precisely what the paranoiac does after his own fashion.

    The Behavior of Crowds Everett Dean Martin
  • His delusions became systematised with all the ingenuity of the paranoiac.


    Horace Barnett Samuel
  • His wife, who applied for his discharge, was also a paranoiac.

    Degeneracy Eugene S. Talbot
  • Between this class and the paranoiac there is at once a curious likeness and distinction.

    Degeneracy Eugene S. Talbot
  • Connecting the paranoiac with the moral imbecile are the so-called “reasoning maniacs.”

    Degeneracy Eugene S. Talbot
  • The prototype which the paranoiac reconstructs in his persecution mania, is found in the relation of the child to its father.

    Totem and Taboo Sigmund Freud
  • You ate and you drank till you looked like a paranoiac bulldog asleep in the sun.

    The Penalty

    Gouverneur Morris
British Dictionary definitions for paranoiac


of, characterized by, or resembling paranoia
(informal) exhibiting undue suspicion, fear of persecution, etc
a person who shows the behaviour patterns associated with paranoia
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
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Word Origin and History for paranoiac

1892 (n. and adj.), from paranoia on model of maniac, etc.



1901, irregularly formed from paranoia + -oid. As a noun, "a paranoid person," attested from 1922.

Online Etymology Dictionary, © 2010 Douglas Harper
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paranoiac in Medicine

paranoiac par·a·noi·ac (pār'ə-noi'āk', -noi'ĭk)
A paranoid. adj.
Of, relating to, or resembling paranoia.

paranoid par·a·noid (pār'ə-noid')
Relating to, characteristic of, or affected with paranoia. n.
One affected with paranoia.

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