Source : Webster's Revised Unabridged Dictionary (1913)

Stylet \Sty"let\, n. [F., dim. of style; cf. It. stiletto. See
   {Stiletto}.]
   A small poniard; a stiletto.

   2. (Surg.)
      (a) An instrument for examining wounds and fistulas, and
          for passing setons, and the like; a probe, -- called
          also {specillum}.
      (b) A stiff wire, inserted in catheters or other tubular
          instruments to maintain their shape and prevent
          clogging.

   3. (Zo["o]l.) Any small, more or less rigid, bristlelike
      organ; as, the caudal stylets of certain insects; the
      ventral stylets of certain Infusoria.