Preventer

1. n. An auxiliary rope to strengthen a mast.
2. n. One who goes before; one who forestalls or anticipates another.
3. n. One who prevents or obstructs; a hinderer; that which hinders; as, a preventer of evils or of disease.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.