preservative

Noun
  1. A chemical compound that is added to protect against decay or decomposition (synset 115022096)
    is a type of: chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
    subtypes: spice - aromatic substances of vegetable origin used as a preservative
Adjective
  1. Tending or having the power to preserve (synset 301894653)
    "timbers should be treated with a preservative substance"
    similar to: protective - intended or adapted to afford protection of some kind

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