Definition allergy in American English

allergy noun

[countable/uncountable] noun

/ˈælərdʒi/

a medical condition in which you become sick or your skin becomes covered with red marks as a reaction to something you eat, breathe, or touch

Example

a food allergy

Example

She has an allergy to cow's milk.

Synonyms and related words

acidity acne ADD allergen allergic allergy

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