[ 'dɪptɪk ]
■ noun
1》 a painting, especially an altarpiece, on two hinged wooden panels which may be closed like a book.
2》 an ancient writing tablet consisting of two hinged leaves with waxed inner sides.
Origin
C17: via late L. from late Gk diptukha 'pair of writing tablets', neut. plural of Gk diptukhos 'folded in two'.