The Collaborative International Dictionary of English v.0.48:

Pen \Pen\ (p[e^]n), n. [OE. penne, OF. penne, pene, F. penne,
   fr. L. penna.]
   1. A feather. [Obs.] --Spenser.
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   2. A wing. [Obs.] --Milton.
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   3. An instrument used for writing with ink, formerly made of
      a reed, or of the quill of a goose or other bird, but now
      also of other materials, as of steel, gold, etc. Also,
      originally, a stylus or other instrument for scratching or
      graving.
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            Graven with an iron pen and lead in the rock. --Job
                                                  xix. 24.
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   4. Fig.: A writer, or his style; as, he has a sharp pen.
      "Those learned pens." --Fuller.
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   5. (Zool.) The internal shell of a squid.
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   6. [Etymol. uncertain.] (Zool.) A female swan; -- contrasted
      with cob, the male swan. [Prov. Eng.]
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   Bow pen. See Bow-pen.

   Dotting pen, a pen for drawing dotted lines.

   Drawing pen, or Ruling pen, a pen for ruling lines having
      a pair of blades between which the ink is contained.

   Fountain pen, Geometric pen. See under Fountain, and
      Geometric.

   Music pen, a pen having five points for drawing the five
      lines of the staff.

   Pen and ink, or pen-and-ink, executed or done with a pen
      and ink; as, a pen and ink sketch.

   Pen feather. A pin feather. [Obs.]

   Pen name. See under Name.

   Sea pen (Zool.), a pennatula. [Usually written sea-pen.]
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The Collaborative International Dictionary of English v.0.48:

pen-and-ink \pen-and-ink\ n.
   A drawing executed with pen and ink.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

pen-and-ink
    n 1: a drawing executed with pen and ink