Dictionary

side effect

noun

: an often harmful and unwanted effect of a drug or chemical that occurs along with the desired effect

: a result of an action that is not expected or intended

Full Definition of SIDE EFFECT

:  a secondary and usually adverse effect (as of a drug) <toxic side effects> —called also side reaction
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First Known Use of SIDE EFFECT

1884
Medical Dictionary

side effect

noun

Medical Definition of SIDE EFFECT

:  a secondary and usually adverse effect (as of a drug) <toxic side effects> <a side effect of drowsiness caused by antihistamines>—called also side reaction

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