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Từ điển Oxford Learners Wordfinder Dictionary

hypersensitivity reaction

noun

an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods);
severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock
• Hypernyms:
hypersensitivity
• Hyponyms:
urtication, urticaria, hives, nettle rash, allergy,
allergic reaction, anaphylaxis, allergic rhinitis