the thin, dried skin of some animals that was used in the past for writing on, or a high-quality paper made to look like this

ancient parchment 古代羊皮纸

He'd been ill for a long time, and his skin was like parchment. 他病了很久，皮肤像羊皮纸似的。

a document written on parchment

A framed parchment hung on the wall. 一张镶了框的羊皮纸文件挂在墙上。