Merriam-Webster Collegiate Dictionary - pen

 I. transitive verb  (~ned; ~ning)  Etymology: Middle English ~nen, from Old English -~nian  Date: 13th century to shut in or as if in a ~  II. noun  Etymology: Middle English, perhaps from ~nen  Date: 14th century  1.  a. a small enclosure for animals  b. the animals in a ~ a ~ of sheep  2. a small place of confinement or storage  3. a protected dock or slip for a submarine  4. bull ~ 2  III. noun  Etymology: Middle English ~ne, from Anglo-French, feather, ~, from Latin ~na, pinna feather; akin to Greek pteron wing — more at feather  Date: 14th century  1. an implement for writing or drawing with ink or a similar fluid: as  a. quill  b. ~ point  c. a ~holder containing a ~ point  d. fountain ~  e. ballpoint  2.  a. a writing instrument regarded as a means of expression enlisted the ~s of the best writers — F. H. Chase  b. writer  3. the internal horny feather-shaped shell of a squid  4. stylus d  IV. transitive verb  (~ned; ~ning)  Date: 15th century write, indite ~ a letter  V. noun  Etymology: origin unknown  Date: circa 1550 a female swan  VI. noun  Date: 1884 ~itentiary  VII. abbreviation ~insula PEN  abbreviation International Association of Poets, Playwrights, Editors, Essayists and Novelists