a hinged two-leaved tablet used in ancient times for writing on with a stylus.
Usually, diptychs.
a similar tablet of wood or metal containing on one leaf the names of those among the living, and on the other those among the dead, for whom prayers and Masses are said.
the lists of such persons.
the intercession in the course of which these names were introduced.
a pair of pictures or carvings on two panels, usually hinged together.

1615–25; < Late Latin diptycha writing tablet with two leaves < Greek díptycha, neuter plural of díptychos folded together, equivalent to di- di-1 + -ptychos, verbid of ptýssein to fold

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World English Dictionary
diptych (ˈdɪptɪk)
1.  a pair of hinged wooden tablets with waxed surfaces for writing
2.  a painting or carving on two panels, usually hinged like a book
[C17: from Greek diptukhos folded together, from di1 + ptukhos fold; compare triptych]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1622, from L. diptycha (pl.), from late Gk. diptykha (neut. pl.), from dis- "two" + ptykhe "fold."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He was seated at his diptych or ancient two-leaved writing-table with inner sides waxed.
For me, this diptych illustrates what is truly unique and remarkable about photography.
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