[pen] 
noun, verb, penned, pen⋅ning.| 1. | any of various instruments for writing or drawing with ink or a similar substance. |
| 2. | a detachable metal penpoint, filled by dipping or with a quill; nib. |
| 3. | such a penpoint with its penholder. |
| 4. | fountain pen. |
| 5. | ball-point pen. |
| 6. | the pen as the instrument of writing or authorship: The pen is mightier than the sword. |
| 7. | a person's style or quality of writing: He writes with a witty, incisive pen. |
| 8. | a writer: I leave this story to abler pens. |
| 9. | the profession of writing: a master of the pen. |
| 10. | stylus (def. 3). |
| 11. | Ornithology.
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| 12. | something resembling or suggesting a feather or quill. |
| 13. | Zoology. an internal, corneous or chitinous, feather-shaped structure in certain cephalopods, as the squid. |
| 14. | to write with or as with a pen; put down in writing: to pen an essay. |
| 15. | to draw with or as with a pen: to pen a sketch. |
[pen] noun, verb, penned or pent, pen⋅ning.| 1. | a small enclosure for domestic animals. |
| 2. | animals so enclosed: We have a pen of twenty sheep. |
| 3. | an enclosure used for confinement or safekeeping: We have built several pens to hold our harvest of corn. |
| 4. | playpen. |
| 5. | bull pen. |
| 6. | a dock having a protective concrete structure overhead, used to service and repair submarines. |
| 7. | to confine in or as in a pen. |
| a combining form occurring in loanwords from Greek, meaning “five” (Pentateuch); on this model, used in the formation of compound words (pentavalent). |
[pent-hous] [-hou-ziz] . | 1. | an apartment or dwelling on the roof of a building, usually set back from the outer walls. |
| 2. | any specially designed apartment on an upper floor, esp. the top floor, of a building. |
| 3. | a structure on a roof for housing elevator machinery, a water tank, etc. |
| 4. | Also called pent, pen⋅tice [pen-tis] . a shed with a sloping roof, or a sloping roof, projecting from a wall or the side of a building, as to shelter a door. |
| 5. | any rooflike shelter or overhanging part. |
| 6. | shed roof. |
| 7. | Court Tennis. a corridor having a slanted roof and projecting from three walls of the court. |
| pen 2 (pěn) n.
To confine in or as if in a pen. See Synonyms at enclose. [Middle English, from Old English penn.] |
| pent (pěnt) v. A past tense and a past participle of pen2. adj. Penned or shut up; closely confined. |
pen
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penta- or pent-
pref.
Five: pentameter.
Containing five atoms, molecules, or groups: pentose.