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Synonyms
id·i·o·syn·cra·sy (ĭd́ē-ō-sĭnǵkrə-sē)

[Greek idiosunkrāsiā, idio-, idio-, + sunkrāsis, mixture, temperament (sun-, syn-) (krāsis, a mixing; see kerə-).]

noun: pl., -sies. 

  1. A structural or behavioral characteristic peculiar to an individual or group.
  2. A physiological or temperamental peculiarity.
  3. An unusual individual reaction to food or a drug.

derivatives

id́i·o·syn·crat́ic
adjective
id́i·o·syn·crat́i·cal·ly
adverb