Where does “orto-” come from?

orto- (Portuguese) comes from Ancient Greek ὀρθο-, 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.

orto- (Portuguese): ortho

Definitions

ortho

Ancestry of “orto-”, step by step

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

Words derived from “orto-”

ortofonia
ortopedia
ortopolifosfato
ortorrômbico
ortovanadato
ortofosfórico
ortónimo
ortofonico
ortofonista
ortopédico
ortopedista
ortopedicamente

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