id·i·o·syn·cra·sy

[id-ee-uh-sing-kruh-see, -sin-]
noun, plural id·i·o·syn·cra·sies.
1.
a characteristic, habit, mannerism, or the like, that is peculiar to an individual.
2.
the physical constitution peculiar to an individual.
3.
a peculiarity of the physical or the mental constitution, especially susceptibility toward drugs, food, etc. Compare allergy ( def 1 ).
Also, idiocrasy.


Origin:
1595–1605; < Greek idiosynkrāsía, equivalent to idio- idio- + syn- syn- + krâs(is) a blending + -ia -y3

id·i·o·syn·crat·ic [id-ee-oh-sin-krat-ik, -sing-] , adjective


1. peculiarity, quirk. See eccentricity.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To idiosyncrasies
00:10
Idiosyncrasies is always a great word to know.
So is bezoar. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
idiosyncrasy (ˌɪdɪəʊˈsɪŋkrəsɪ) [Click for IPA pronunciation guide]
 
n , pl -sies
1.  a tendency, type of behaviour, mannerism, etc, of a specific person; quirk
2.  the composite physical or psychological make-up of a specific person
3.  an abnormal reaction of an individual to specific foods, drugs, or other agents
 
[C17: from Greek idiosunkrasia, from idio- + sunkrasis mixture, temperament, from sun-syn- + kerannunai to mingle]

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Etymonline
Word Origin & History

idiosyncrasy
c.1600, from Fr. idiosyncrasie, from Gk. idiosynkrasia "a peculiar temperament," from idios "one's own" (see idiom) + synkrasis "temperament, mixture of personal characteristics," from syn "together" + krasis "mixture." Originally in English a medical term meaning "physical
constitution of an individual." Mental sense first attested 1660s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

idiosyncrasy id·i·o·syn·cra·sy (ĭd'ē-ō-sĭng'krə-sē)
n.

  1. A structural or behavioral trait peculiar to an individual or a group.

  2. A physiological or temperamental peculiarity.

  3. An unusual individual reaction to food or a drug.


id'i·o·syn·crat'ic (-sĭn-krāt'ĭk) adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The software also reveals the idiosyncrasies of thousands of guests.
Less time for linguistic idiosyncrasies to creep up.
There are idiosyncrasies and details you are not going to figure out your first
  time doing it.
On the page her idiosyncrasies can be less attractive.
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