Where does “diftongusok” come from?

diftongusok (Hungarian) comes from Hungarian diftongus, from Late Latin diphthongus, from Ancient Greek δίφθογγος, from Ancient Greek δί-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

Ancestry of “diftongusok”, step by step

Step	Language	Word	Meaning
1	Hungarian	diftongus	diphthong
2	Late Latin	diphthongus	diphthong
3	Ancient Greek	δίφθογγος	with two sounds; a diphthong
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 →