preventer
Noun
Meaning
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 dictionarySynonyms
Antonyms
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Examples
A preventer can be rigged to reduce danger and damage from accidental jibes.
In the areas where you are not seeding your first feeding will be Turf Builder with Halts Crabgrass Preventer.
Scotts Turf Builder Starter Food for New Grass plus Weed Preventer is especially designed for this purpose.
It is held to be not only a cure for physical ailments but a preventer of sickness.
One term for this role is “dispute preventer”.