Where does “oat” come from?

Oat comes from Middle English ote, from Old English āte, from Proto-Germanic aitǭ, from Proto-Indo-European h₁eid-, of uncertain ultimate origin.

oat (English): Widely cultivated cereal grass, typically "Avena...

Definitions

Step	Language	Word	Meaning
1	Middle English	ote	The oat plant; A grain of this plant
2	Old English	āte	oat
3	Proto-Baltic	aitā	—
4	Proto-Germanic	aitǭ	swelling; swelling; gland; nodule
5	Proto-Indo-European	h₁eid-	to swell