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preservative

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preservative/prɪˈzɚvətɪv/noun
pluralpreservatives
preservative
/prɪˈzɚvətɪv/
noun
pluralpreservatives
Learner's definition of PRESERVATIVE  
[count, noncount]
: a substance that is used to preserve something: such as
: a chemical that is added to food to keep it fresh longer
   b  : a substance that is used on wood to prevent it from decaying
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