Where does “kettőshangzók” come from?

kettőshangzók (Hungarian) comes from Hungarian kettőshangzó, from Hungarian hangzó, from Hungarian hangzik, from Hungarian -zik, from Hungarian -z, from Proto-Uralic -ta- — Forms verbs from nouns; Forms causative verbs...

Ancestry of “kettőshangzók”, step by step

Step	Language	Word	Meaning
1	Hungarian	kettőshangzó	diphthong
2	Hungarian	hangzó	present participle of hangzik; sounding; vowel
3	Hungarian	hangzik	to sound
4	Hungarian	-zik	Appended to a noun to form a verb
5	Hungarian	-z	Appended to a noun to form a verb
6	Proto-Uralic	-ta-	Forms verbs from nouns; Forms causative verbs...

Every word from Proto-Uralic -ta- →Every word from Hungarian -z →Every word from Hungarian -zik →