The Collaborative International Dictionary
specillum
Stylet \Sty"let\, n. [F., dim. of style; cf. It. stiletto. See Stiletto.] A small poniard; a stiletto. 2. (Surg.)
An instrument for examining wounds and fistulas, and for passing setons, and the like; a probe, -- called also specillum.
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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.