Where does “diadem” come from?

diadem (Danish) comes from Ancient Greek διάδημα, from Ancient Greek διαδέω, from Ancient Greek δῐᾰ-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

diadem (Danish): diadem, tiara

Definitions

diadem, tiara

Ancestry of “diadem”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	διάδημα	headband
2	Ancient Greek	διαδέω	to encircle, bind, wrap around; I bind around;...
3	Ancient Greek	δῐᾰ-	apart; through, across; through; in different...
4	Ancient Greek	διά	throughout
5	Proto-Indo-European	dwís	twice, doubly; in two
6	Proto-Indo-European	dwóh₁	two

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