D defs.my
Entry 3 senses Webster, 1913

Preventer

· Pre·vent·er · IPA
01 n. One who goes before; one who forestalls or anticipates another.
  1. 1.
    One who goes before; one who forestalls or anticipates another.[Obs.]
  2. 2.
    One who prevents or obstructs; a hinderer; that which hinders; as, a preventer of evils or of disease.
  3. 3.
    An auxiliary rope to strengthen a mast.(Naut.)
Phrases & compounds
Preventer bolts — fixtures connected with preventers to reënforce other rigging.
Preventer stay — Same as Preventer, 3.