Noun
One who goes before; one who forestalls or anticipates another.
One who prevents or obstructs; a hinderer; that which hinders; as, a preventer of evils or of disease.
An auxiliary rope to strengthen a mast.
Source: Webster's dictionaryA preventer can be rigged to reduce danger and damage from accidental jibes. Source: Internet
In the areas where you are not seeding your first feeding will be Turf Builder with Halts Crabgrass Preventer. Source: Internet
Scotts Turf Builder Starter Food for New Grass plus Weed Preventer is especially designed for this purpose. Source: Internet
It is held to be not only a cure for physical ailments but a preventer of sickness. Source: Internet
One term for this role is “dispute preventer”. Source: Internet