The Collaborative International Dictionary of English v.0.48:

Stiletto \Sti*let"to\, n.; pl. Stilettos. [It., dim. of stilo
   a dagger, fr. L. stilus a pointed instrument. See Style for
   writing, and cf. Stylet.]
   1. A kind of dagger with a slender, rounded, and pointed
      blade.
      [1913 Webster]

   2. A pointed instrument for making eyelet holes in
      embroidery.
      [1913 Webster]

   3. A beard trimmed into a pointed form. [Obs.]
      [1913 Webster]

            The very quack of fashions, the very he that
            Wears a stiletto on his chin.         --Ford.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stiletto \Sti*let"to\, v. t. [imp. & p. p. Stilettoed; p. pr.
   & vb. n. Stilettoing.]
   To stab or kill with a stiletto. --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stiletto
    n 1: a small dagger with a tapered blade