[ id-ee-uh-sing-kruh-see, -sin- ]
/ ˌɪd i əˈsɪŋ krə si, -ˈsɪn- /
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See synonyms for: idiosyncrasy / idiosyncrasies / idiosyncratic on Thesaurus.com

noun, plural id·i·o·syn·cra·sies.
a characteristic, habit, mannerism, or the like, that is peculiar to an individual.
the physical constitution peculiar to an individual.
a peculiarity of the physical or the mental constitution, especially susceptibility toward drugs, food, etc.Compare allergy (def. 1).
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Also idiocrasy.

Origin of idiosyncrasy

First recorded in 1595–1605; from Greek idiosynkrāsía, equivalent to idio- idio- + syn- syn- + krâs(is) “a blending” + -ia -y3

synonym study for idiosyncrasy

1. See eccentricity.

OTHER WORDS FROM idiosyncrasy

id·i·o·syn·crat·ic [id-ee-oh-sin-krat-ik, -sing-], /ˌɪd i oʊ sɪnˈkræt ɪk, -sɪŋ-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use idiosyncrasy in a sentence

British Dictionary definitions for idiosyncrasy

/ (ˌɪdɪəʊˈsɪŋkrəsɪ) /

noun plural -sies
a tendency, type of behaviour, mannerism, etc, of a specific person; quirk
the composite physical or psychological make-up of a specific person
an abnormal reaction of an individual to specific foods, drugs, or other agents

Word Origin for idiosyncrasy

C17: from Greek idiosunkrasia, from idio- + sunkrasis mixture, temperament, from sun- syn- + kerannunai to mingle
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

Medical definitions for idiosyncrasy

[ ĭd′ē-ō-sĭngkrə-sē ]

A structural or behavioral trait peculiar to an individual or a group.
A physiological or temperamental peculiarity.
An unusual individual reaction to food or a drug.

Other words from idiosyncrasy

id′i•o•syn•cratic (-sĭn-krătĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.