idiot

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idiot

 [id´e-ot]
old term for profound mental retardation, now considered offensive.
idiot savant a person who is generally mentally retarded, yet has a particular mental faculty developed to an unusually high degree, such as for mathematics or music.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

idiot

(ĭd′ē-ət)
n.
A person with profound intellectual disability having a mental age below three years and generally unable to learn connected speech or guard against common dangers. The term belongs to a classification system no longer in use and is now considered offensive.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

Idiot

Neurology
An obsolete term formerly used for an individual with profound mental retardation (IQ < 20).
 
Vox populi
A derogatory term used indiscriminately for an obtuse person, regardless of that person’s tested IQ.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

idiot

A person of severe mental deficit, incapable of coherent speech or of normal response to danger.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005