アレルギー

Definition

An immune reaction to a normally harmless substance. Japan has high rates of cedar pollen allergy (花粉症 kafunshou) affecting millions each spring.

Example

Etymology

アレルギー (arerugii) is a loanword from the English term 'allergy', reflecting Japan’s adaptation of Western medical terminology in the late 20th century.

How & Where It’s Used

アレルギー is predominantly used in medical contexts and discussions, suitable for both formal and informal registers. It is widely recognized in urban regions with cosmopolitan influences.

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