Where does “oto” come from?

oto (Esperanto) comes from Ancient Greek ὠτ-, from Ancient Greek οὖς, from Ancient Greek ὀδούς, from Proto-Hellenic odónts, from Proto-Indo-European h₃dónts, from Proto-Indo-European h₁ed- — to eat.

oto (Esperanto): ear

Definitions

Ancestry of “oto”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὠτ-	—
2	Ancient Greek	οὖς	ear; hearing; spy
3	Ancient Greek	ὀδούς	A tooth, tusk; anything pointed: spike, prong;...
4	Proto-Hellenic	odónts	tooth
5	Proto-Indo-European	h₃dónts	tooth
6	Proto-Indo-European	h₁ed-	to eat

Every word from Proto-Indo-European h₁ed- →Every word from Proto-Indo-European h₃dónts →Every word from Proto-Hellenic odónts →