Main Entry: id·io·syn·cra·sy

Pronunciation: \ˌid-ē-ə-ˈsiŋ-krə-sē\

Function: noun

Inflected Form(s): plural id·io·syn·cra·sies

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>