idiosyncrasy; allergy
Medical term for an individual's unusual or allergic reaction to a substance. Used in clinical contexts.
This medicine can cause an idiosyncratic reaction.
Choose a treatment method considering the patient's idiosyncrasy.
Compound of 特異 (とくい, 'peculiar, unique') and 質 (しつ, 'quality, nature'). The exact historical derivation is uncertain; the term is used in modern medical Japanese.