Preservative

1. n. That which preserves, or has the power of preserving; a presevative agent.
2. a. Having the power or quality of preserving; tending to preserve, or to keep from injury, decay, etc.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.