men·tal

1 [men-tl]
adjective
1.
of or pertaining to the mind: mental powers; mental suffering.
2.
of, pertaining to, or affected by a disorder of the mind: a mental patient; mental illness.
3.
providing care for persons with disordered minds, emotions, etc.: a mental hospital.
4.
performed by or existing in the mind: mental arithmetic; a mental note.
5.
pertaining to intellectuals or intellectual activity.
6.
Informal. slightly daft; out of one's mind; crazy: He's mental.
noun
7.
Informal. a person with a psychological disorder: a fascist group made up largely of mentals.
00:10
Mental is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.

Origin:
1375–1425; late Middle English < Late Latin mentālis, equivalent to Latin ment- (stem of mēns) mind + -ālis -al1

Dictionary.com Unabridged

men·tal

2 [men-tl]
adjective
of or pertaining to the chin.

Origin:
1720–30; < Latin ment(um) the chin (see mentum) + -al1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
mental1 (ˈmɛntəl) [Click for IPA pronunciation guide]
 
adj
1.  of or involving the mind or an intellectual process
2.  occurring only in the mind: mental calculations
3.  Preferred form: psychiatric affected by mental illness: a mental patient
4.  Preferred form: psychiatric concerned with care for persons with mental illness: a mental hospital
5.  slang insane
 
[C15: from Late Latin mentālis, from Latin mēns mind]
 
'mentally1
 
adv

mental2 (ˈmɛntəl) [Click for IPA pronunciation guide]
 
adj
anatomy Also: genial of or relating to the chin
 
[C18: from Latin mentum chin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

mental
early 15c., from M.Fr. mental, from L.L. mentalis "of the mind," from L. mens (gen. mentis) "mind," from PIE base *men- "to think" (cf. Skt. matih "thought, mind," Goth. gamunds, O.E. gemynd "memory, remembrance," Mod.Eng. mind). Meaning "crazy, deranged" is from 1927.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mental men·tal1 (měn'tl)
adj.

  1. Of or relating to the mind; intellectual.

  2. Of, relating to, or affected by a disorder of the mind.

  3. Intended for treatment of people affected with disorders of the mind.

mental 2
adj.
Of or relating to the chin.

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

mental definition


  1. mod.
    mentally retarded. (Usually objectionable. Derogatory.) : The girl's mental. Leave her alone.
  2. n.
    a mentally retarded person. (Usually objectionable. Derogatory.) : He's a mental. He'll need some help.
  3. n.
    a stupid person. : You're such a mental lately.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences
But the experience of using your mind's eye doesn't fully explain the mental
  processing that goes on beneath the surface.
How a mental gym can tone your mind and stave off memory loss.
Researchers are again using mind-bending drugs as a means of treating mental
  disorders.
Inbreeding in the spirit of preserving the blood lines of nobility, or
  whatever, produces mental and physical deformity.
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