Longman Dictionary of Contemporary English homepage

side effect

 noun
     
Related topics: Drugs, Medicines, Illness and Disability
side effect [countable]
1MI an effect that a drug has on your body in addition to curing pain or illness
harmful/serious/adverse etc side effect
a natural remedy with no harmful side effects
side effect of
the side effects of the medication
2 an unexpected or unplanned result of a situation or event:
These policy changes could have beneficial side effects for the whole economy.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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