Scleria latifolia

from The Collaborative International Dictionary of English v.0.48
Knife \Knife\ (n[imac]f), n.; pl. {Knives} (n[imac]vz). [OE.
   knif, AS. cn[imac]f; akin to D. knijf, Icel. kn[imac]fr, Sw.
   knif, Dan. kniv.]
   1. An instrument consisting of a thin blade, usually of steel
      and having a sharp edge for cutting, fastened to a handle,
      but of many different forms and names for different uses;
      as, table knife, drawing knife, putty knife, pallet knife,
      pocketknife, penknife, chopping knife, etc..
      [1913 Webster]

   2. A sword or dagger.
      [1913 Webster]

            The coward conquest of a wretch's knife. --Shak.
      [1913 Webster]

   {Knife grass} (Bot.) a tropical American sedge ({Scleria
      latifolia}), having leaves with a very sharp and hard
      edge, like a knife.

   {War to the knife}, mortal combat; a conflict carried to the
      last extremity.
      [1913 Webster]
    

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