noun / adjective

preservative

prih-ZUR-vuh-tiv/prizˈɝvʌtɪv/

A substance or quality that prevents spoilage, decay, or loss.

Salt acts as a preservative by slowing spoilage in food.

Close view of a hand sprinkling clearly drawn salt crystals from a small spoon onto food in a plain preservation vessel; salt as added substance is central, restrained food depiction with dark pen hatching, no labels or recipe instructions.

Etymology

preLatinbefore

+servLatinto keep safe

+ativeLatintending to

The pieces express ‘tending to guard beforehand.’ The adjective meaning ‘protective’ became a noun for something that keeps things safe, including a substance added to prevent spoilage.

In context

Yaron Brook75:57

ethyl Mercury which is a soluble form of mercury and it's put in there as a preservative because we want to have multi-use vials where you can it keeps it sterile

Amesh Adalja & Yaron Discuss Covid, Vaccines, Lessons Learned | Yaron Interviews

More examples

This bread contains no artificial preservatives.
We treat the fence with a wood preservative to prevent rot.
The preservative effects of drying help fruit last longer.

Forms

preservative · preservatives

preserve verb — To protect from decay, damage, or loss.

preservation noun — The act of preventing decay or loss.

Similar words

antioxidant: Prevents damage from oxidation rather than every kind of decay.
antimicrobial: Stops microbial growth but does not prevent all spoilage.