Made thin, weak, or less intense; reduced in strength, effect, or force.
From Latin 'attenuatus,' past participle of 'attenuare.' Used in English since the 16th century to describe things that have been deliberately weakened or naturally worn down.
Attenuated viruses are the scientific secret behind many vaccines—scientists weaken dangerous viruses so they can't cause serious disease but still train your immune system to recognize the threat.
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