diptych
/ˈdɪptɪk/noun
1
- a painting, especially an altarpiece, on two hinged wooden panels which may be closed like a book（尤指用来装饰祭坛的）可折闭的双连画。
2
- an ancient writing tablet consisting of two hinged leaves with waxed inner sides（古代内侧上蜡的）双连书写板。
词源
early 17th cent.: via late Latin from late Greek diptukha 'pair of writing tablets', neuter plural of Greek diptukhos 'folded in two', from di- 'twice' + ptukhē 'a fold'.