Where does “rau dớn” come from?

rau dớn (Vietnamese) comes from Vietnamese râu, from Proto-Vietic -soː, from Old Chinese 鬚.

rau dớn (Vietnamese): vegetable fern (Diplazium esculentum)

Definitions

  1. vegetable fern (Diplazium esculentum)

Ancestry of “rau dớn”, step by step

rau dớn traces back through two separate lines of ancestry.

via Vietnamese râu

StepLanguageWordMeaning
1Vietnameserâua beard; whiskers; barbels
2Proto-Vietic-soː—
3Old Chinese鬚—

via Vietnamese đơn

StepLanguageWordMeaning
1Vietnameseđơnapplication, petition, request; alone, only
2Proto-Mon-Khmerɗuənwide hat of straw
Every word from Old Chinese 鬚 →Every word from Proto-Vietic -soː →Every word from Vietnamese râu →