(pen) noun
1. An instrument for writing with a fluid ink: formerly made of a quill, now usually of metal and fitted to a holder; by extension, pen and holder together.
2. Quality of penmanship or of composition.
3. A writer; also, the profession of writing.
4. Bot. The midrib of a leaf.
5. Zool. The internal shell of a cuttlefish.
6. Ornithol. A feather; quill; also, in the plural, wings.
—v.t. penned, pen·ning To write with a pen; indite. [<OF penne a pen, a feather <LL penna <L, a feather]
—pen′ner noun

(pen) noun
1. A small enclosure, as for pigs; also, the animals contained in a pen collectively.
2. Any small place of confinement, as in a police court.
3. Slang A penitentiary.
—v.t. penned or pent, pen·ning To enclose in or as in a pen; confine. [OE penn]

(pen) noun
A female swan. [Origin unknown]