Where does “đá nhám” come from?

đá nhám (Vietnamese) comes from Vietnamese đá, from Chinese 肚, from Proto-Sino-Tibetan l-tjwa — mouth; beak; food; stomach; mouth, beak, food,...

đá nhám (Vietnamese): emery; pumice stone

Definitions

  1. emery; pumice stone

Ancestry of “đá nhám”, step by step

đá nhám traces back through two separate lines of ancestry.

via Vietnamese đá

StepLanguageWordMeaning
1Vietnameseđárock, stone; ice as used for consumption or...
2Chinese肚—
3Proto-Sino-Tibetanl-tjwamouth; beak; food; stomach; mouth, beak, food,...

via Vietnamese nhám

StepLanguageWordMeaning
1Vietnamesenhámrough, harsh, fuzzy
2Proto-Vietic-ɲaːmʔ—
Every word from Proto-Sino-Tibetan l-tjwa →Every word from Chinese 肚 →Every word from Vietnamese đá →