opisthograph

n.(羊皮纸正反两面都写有文字的)古手稿本,(正反两面刻印有文字的)古字板

一张纸的两面都写满文字的情况，尤指手稿。

名词

The ancient manuscript is an opisthograph, with text written on both sides of the parchment.
这份古代手稿是一份opisthograph，纸张的两面都有文字写在羊皮纸上。