idiosyncrasy


id·io·syn·cra·sy

noun \ˌid-ē-ə-ˈsiŋ-krə-sē\
plural id·io·syn·cra·sies

Definition of IDIOSYNCRASY

1
: a peculiarity of physical or mental constitution or temperament
2
: individual hypersensitiveness (as to a drug or food) <anemia accompanying the use of a sulfa drug is usually considered to be due to idiosyncrasy>

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