Where does “oatless” come from?

oatless (English) comes from English oat, from Middle English ote, from Old English āte, from Proto-Baltic aitā, from Proto-Germanic aitǭ, from Proto-Indo-European h₁eid- — to swell.

oatless (English): Without oats

Definitions

  1. Without oats

Ancestry of “oatless”, step by step

oatless traces back through two separate lines of ancestry.

via English oat

StepLanguageWordMeaning
1EnglishoatWidely cultivated cereal grass, typically "Avena...
2Middle EnglishoteThe oat plant; A grain of this plant
3Old Englishāteoat
4Proto-Balticaitā
5Proto-Germanicaitǭswelling; swelling; gland; nodule
6Proto-Indo-Europeanh₁eid-to swell

via English less

StepLanguageWordMeaning
1EnglishlessTo a smaller extent or degree; comparative form...
2Middle Englishlesfalse; lying; deceptive; falsehood; a lie
3Old Englishlēasfalse, lax; false, void, loose; devoid of, loose...
4Proto-Germanic*laus
Every word from Proto-Indo-European h₁eid-