Where does “diptycha” come from?

diptycha (Latin) comes from Ancient Greek δίπτυχος, from Ancient Greek δί-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

Ancestry of “diptycha”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	δίπτυχος	folded, doubled
2	Ancient Greek	δί-	Twice, double
3	Ancient Greek	διά	throughout
4	Proto-Indo-European	dwís	twice, doubly; in two
5	Proto-Indo-European	dwóh₁	two

Words derived from “diptycha”

diptych
diptyque
díptic
diptic

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-European dwís →Every word from Ancient Greek διά →