a feather.-a wing.-an instrument used for writing with ink, formerly made of a reed, or of the quill of a goose or other bird, but now also of other materials, as of steel, gold, etc. also, originally, a stylus or other instrument for scratching or graving.-fig.: a writer, or his style; as, he has a sharp pen.-the internal shell of a squid.-a female swan.-to write; to compose and commit to paper; to indite; to compose; as, to pen a sonnet.-to shut up, as in a pen or cage; to confine in a small inclosure or narrow space; to coop up, or shut in; to inclose.-a small inclosure; as, a pen for sheep or for pigs.