Where does “diptic” come from?

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

diptic (Romanian): diptych

Definitions

diptych

Ancestry of “diptic”, step by step

Step	Language	Word	Meaning
1	French	diptyque	diptych
2	Latin	diptycha	—
3	Ancient Greek	δίπτυχος	folded, doubled
4	Ancient Greek	δί-	Twice, double
5	Ancient Greek	διά	throughout
6	Proto-Indo-European	dwís	twice, doubly; in two
7	Proto-Indo-European	dwóh₁	two

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