Where does “oatgrass” come from?

oatgrass (English) comes from English grass, from Middle English gras, from Old English græs, from Proto-West Germanic gras, from Proto-Germanic grasą, from Proto-Indo-European ǵʰreh₁- — to become green, grow; to grow; to green, to grow.

oatgrass (English): Any of various grasses resembling oats

Definitions

  1. Any of various grasses resembling oats

Ancestry of “oatgrass”, step by step

oatgrass traces back through two separate lines of ancestry.

via English grass

StepLanguageWordMeaning
1EnglishgrassAny plant of the family Poaceae, characterized by...
2Middle EnglishgrasA grass; Any plant; especially a herbaceous one;...
3Old Englishgræsgrass
4Proto-West Germanicgrasgrass
5Proto-Germanicgrasągrass
6Proto-Indo-Europeanǵʰreh₁-to become green, grow; to grow; to green, to grow

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
Every word from Proto-Indo-European ǵʰreh₁-