The plural form of diptych, referring to multiple two-paneled folding tablets or artworks used historically for writing or religious images.
From Greek 'diptychos' meaning 'folded in two,' from 'di-' (two) and 'ptychē' (fold). The word entered English via Latin 'diptycha.'
Early Christian churches used ivory diptychs as official lists of bishops and martyrs—they were basically the medieval version of a yearbook, but way fancier and way more important.
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