noun
a damaging immune response by the body to a substance, especially pollen, fur, a particular food, or dust, to which it has become hypersensitive
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The doctor diagnosed her with a severe peanut allergy.
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I can't eat shellfish because of my allergy.
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I have a pollen allergy, so I hate going outside in the spring.
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His allergy to criticism makes it difficult for him to accept feedback.