Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. A pointed instrument for making eyelet holes in
      embroidery.

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

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

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

Source : WordNet®

stiletto
     n : a small dagger with a tapered blade
     [also: {stilettoeing}]