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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 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. [1913 Webster] 3. (Zool.) (a) A spine of the hedgehog or porcupine. (b) The pen of a squid. See Pen. [1913 Webster] 4. (Mus.) (a) The plectrum with which musicians strike the strings of certain instruments. (b) The tube of a musical instrument. [1913 Webster] He touched the tender stops of various quills. --Milton. [1913 Webster] 5. Something having the form of a quill; as: (a) The fold or plain of a ruff. (b) (Weaving) A spindle, or spool, as of reed or wood, upon which the thread for the woof is wound in a shuttle. (c) (Mach.) A hollow spindle. [1913 Webster] 6. (Pharm.) A roll of dried bark; as, a quill of cinnamon or of cinchona. [Webster 1913 Suppl.] 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. [Jocose] Quill nib, a small quill pen made to be used with a holder. --Simmonds. [1913 Webster]