Preservative

a.	1.	Having the power or quality of preserving; tending to preserve, or to keep from injury, decay, etc.
n.	1.	That which preserves, or has the power of preserving; a presevative agent. To wear tablets as preservatives against the plague. - Bacon.

Noun	1.	preservative - a chemical compound that is added to protect against decay or decomposition
Adj.	1.	preservative - tending or having the power to preserve; "the timbers should be treated with a preservative"

backward, brine, conservational, conservationist, conservative, conservatory, conserving, die-hard, embalming fluid, fogyish, formaldehyde, keeping, nonprogressive, old-fashioned, old-fogyish, old-line, opposed to change, preservative medium, preservatory, preserving, protective, right-wing, salt, saving, standpat, ultraconservative, unprogressive, vinegar