Preventer bolts

from The Collaborative International Dictionary of English v.0.48
Preventer \Pre*vent"er\, n.
   1. One who goes before; one who forestalls or anticipates
      another. [Obs.] --Bacon.
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   2. One who prevents or obstructs; a hinderer; that which
      hinders; as, a preventer of evils or of disease.
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   3. (Naut.) An auxiliary rope to strengthen a mast.
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   {Preventer bolts}, or {Preventer plates} (Naut.), fixtures
      connected with preventers to re["e]nforce other rigging.
      

   {Preventer stay}. (Naut.) Same as {Preventer}, 3.
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