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Definition of “side effect” - English Dictionary

"side effect" in American English

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side effectnoun [C usually pl]

us   /ˈsɑɪd ɪˌfekt/
an unwanted or unexpected result or condition that comes along with the desired effects of something: Does this drug have any side effects?
(Definition of side effect from the Cambridge Academic Content Dictionary © Cambridge University Press)







"side effect" in British English

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side effectnoun [C]

uk   /ˈsaɪd ɪˌfekt/ us   /ˈsaɪd ɪˌfekt/
C1 an unpleasant effect of a drug that happens in addition to the main effect: Does this drug have any side effects?
C2 an unexpected result of a situation: A side effect of the new law is that fewer people will take out insurance.

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(Definition of side effect from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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