Where does “ὀρθοδίκαιος” come from?

ὀρθοδίκαιος (Ancient Greek) comes from Ancient Greek ὀρθός, from Proto-Hellenic ortʰwós, from Proto-Indo-European h₃r̥dʰwós, from Proto-Indo-European h₃erdʰ-, from Proto-Indo-European -wós — Creates adjectives from verb stems.

ὀρθοδίκαιος (Ancient Greek): straight and just

Definitions

straight and just

Ancestry of “ὀρθοδίκαιος”, step by step

ὀρθοδίκαιος traces back through two separate lines of ancestry.

via Ancient Greek ὀρθός

Step	Language	Word	Meaning
1	Ancient Greek	ὀρθός	straight, upright, erect; straight forward, in a...
2	Proto-Hellenic	ortʰwós	—
3	Proto-Indo-European	h₃r̥dʰwós	—
4	Proto-Indo-European	h₃erdʰ-	to increase, grow; upright, high
5	Proto-Indo-European	-wós	Creates adjectives from verb stems

via Ancient Greek δίκαιος

Step	Language	Word	Meaning
1	Ancient Greek	δίκαιος	observant of custom, orderly, civilized;...
2	Ancient Greek	δῐ́κη	law, order; right; judgment; justice; lawsuit;...
3	Proto-Indo-European	deyḱ-	to point out

Every word from Proto-Indo-European -wós →Every word from Proto-Indo-European h₃erdʰ- →Every word from Proto-Indo-European h₃r̥dʰwós →