Where does “đường thẳng” come from?

đường thẳng (Vietnamese) comes from Vietnamese Đường, from Proto-Southwestern Tai daːŋᴬ², from Middle Chinese 唐.

đường thẳng (Vietnamese): a line

Definitions

  1. a line

Ancestry of “đường thẳng”, step by step

đường thẳng traces back through two separate lines of ancestry.

via Vietnamese Đường

StepLanguageWordMeaning
1VietnameseĐườngrelated to Tang
2Proto-Southwestern Taidaːŋᴬ²road; way
3Middle Chinese唐—

via Vietnamese thẳng

StepLanguageWordMeaning
1Vietnamesethẳngstraight
2Chinese湯—
3Proto-Sino-Tibetanr-la(w)ŋsteam; hot
Every word from Middle Chinese 唐 →Every word from Proto-Southwestern Tai daːŋᴬ² →Every word from Vietnamese Đường →