What is "quill bit"

Quill \Quill\, n. [Perhaps fr. F. quille ninepin (see Kayless); but cf. also G. kiel a quill. MHG. kil, and Ir. cuille a quill.]

1. One of the large feathers of a bird's wing, or one of the rectrices of the tail; also, the stock of such a feather.

2. A pen for writing made by sharpening and splitting the point or nib of the stock of a feather; as, history is the proper subject of his quill.
   --Sir H. Wotton.

3. (Zo["o]l.)

   1. A spine of the hedgehog or porcupine.

   2. The pen of a squid. See Pen.

4. (Mus.)

   1. The plectrum with which musicians strike the strings of certain instruments.

   2. The tube of a musical instrument.

      He touched the tender stops of various quills.
      --Milton.

5. Something having the form of a quill; as:

   1. The fold or plain of a ruff.

   2. (Weaving) A spindle, or spool, as of reed or wood, upon which the thread for the woof is wound in a shuttle.

   3. (Mach.) A hollow spindle.

6. (Pharm.) A roll of dried bark; as, a quill of cinnamon or of cinchona.

   Quill bit, a bit for boring resembling the half of a reed split lengthways and having its end sharpened like a gouge.

   Quill driver, one who works with a pen; a writer; a clerk.

   Quill nib, a small quill pen made to be used with a holder.
   --Simmonds.

n. A bit for bore, resembling half of a reed split lengthways and having its end sharpened like a gouge.