| PEN | the United States military establishment |
|---|---|
| PEN | a five-sided polygon |
| PEN | of or relating to or shaped like a pentagon |
| PEN | a star with 5 points |
| PEN | any polyhedron having five plane faces |
| PEN | brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third |
| PEN | (botany) divided into five parts |
| PEN | a verse line having five metrical feet |
| PEN | a drug used as a circulatory and respiratory stimulant |
| PEN | of or relating to or shaped like a pentagon |
| PEN | a clear liquid carboxylic acid used in perfumes and drugs |
| PEN | wormlike arthropod having two pairs of hooks at the sides of the mouth |