noun
An enclosure (enclosed area) used to contain domesticated animals, especially sheep or cattle.
(slang) A penitentiary, i.e. a state or federal prison for convicted felons.
(baseball) The bullpen.
verb
(transitive) To enclose in a pen.
noun
A tool, originally made from a feather but now usually a small tubular instrument, containing ink used to write or make marks.
(figurative) A writer, or their style.
(colloquial) Marks of ink left by a pen.
A light pen.
(zoology) The internal cartilage skeleton of a squid, shaped like a pen.
(now rare, poetic, dialectal) A feather, especially one of the flight feathers of a bird, angel etc.
(poetic) A wing.
A syringe-like device for injecting a dose of medication such as insulin or epinephrine. (See Injector pen.)
Ellipsis of vapor pen (“electronic cigarette”).
verb
(transitive) To write (an article, a book, etc.).
noun
A female swan.
noun
(soccer, slang) Penalty.
noun
(computing, informal) Penetration.
noun
(humorous) plural of pan