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reaction

noun [C] (UNPLEASANT EFFECT)
 
 
/riˈæk.ʃən/

Definition

B2 B2 an unpleasant effect resulting from eating particular things or taking particular drugs: Some people have an allergic reaction to shellfish.Poisoning and allergy
(Definition of reaction noun (UNPLEASANT EFFECT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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