Where does “orto” come from?

orto (Esperanto) 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.

orto (Esperanto): right angle

Definitions

right angle

Ancestry of “orto”, step by step

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

Words derived from “orto”

ortangulo
ortangula

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