Where does “archidiāconus” come from?

archidiāconus (Latin) comes from Ancient Greek ἀρχιδιάκονος, from Ancient Greek δῐᾱ́κονος.

Ancestry of “archidiāconus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἀρχιδιάκονος	—
2	Ancient Greek	δῐᾱ́κονος	—

archidiāconus — Etymology, Origin & Word History | Etymology Explorer