Plural of diptych; multiple two-paneled hinged tablets or artworks, commonly made from ivory or wood, used for writing or religious imagery in ancient and medieval times.
English plural of 'diptych,' from Greek 'diptychos' (folded in two). The '-s' plural ending reflects English grammatical convention.
Wealthy Roman families collected diptychs like we collect phones today—carved from elephant ivory, they were status symbols that also happened to be functional writing tablets.
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