preservative
1. [ adjective ] tending or having the power to preserve
Examples:

"the timbers should be treated with a preservative"

Related terms: protective
2. [ noun ] (chemistry) a chemical compound that is added to protect against decay or decomposition
Related terms: compound spice
Similar spelling:   preserves
  preserver
  preserved
  preservation
  preservable
  preservationist
  prescriptive
  preserving
  proscription
  Presgraves
  prescription