Where does “đoạn thẳng” come from?

đoạn thẳng (Vietnamese) comes from Vietnamese thẳng, from Chinese 湯, from Proto-Sino-Tibetan r-la(w)ŋ — steam; hot.

đoạn thẳng (Vietnamese): a line segment

Definitions

  1. a line segment

Ancestry of “đoạn thẳng”, step by step

đoạn thẳng traces back through two separate lines of ancestry.

via Vietnamese thẳng

StepLanguageWordMeaning
1Vietnamesethẳngstraight
2Chinese湯—
3Proto-Sino-Tibetanr-la(w)ŋsteam; hot

via Vietnamese đoạn

StepLanguageWordMeaning
1Vietnameseđoạnsection, portion; section
Every word from Proto-Sino-Tibetan r-la(w)ŋ →Every word from Chinese 湯 →Every word from Vietnamese thẳng →