Where does “áo dầu” come from?

áo dầu (Vietnamese) comes from Vietnamese áo, from Proto-Vietic ʔaːwʔ, from Proto-Mon-Khmer ʔaawʔ — upper garment.

áo dầu (Vietnamese): a waterproof coat or cloak that is usually worn in rain or other liquid precipitations such as a raincoat; rainsuit and rainjacket

Definitions

  1. a waterproof coat or cloak that is usually worn in rain or other liquid precipitations such as a raincoat; rainsuit and rainjacket

Ancestry of “áo dầu”, step by step

áo dầu traces back through two separate lines of ancestry.

via Vietnamese áo

StepLanguageWordMeaning
1Vietnameseáoa top; an outfit
2Proto-Vieticʔaːwʔ—
3Proto-Mon-Khmerʔaawʔupper garment

via Vietnamese dầu

StepLanguageWordMeaning
1Vietnamesedầuoil; "Dipterocarpus"
2Middle Chinese油—
Every word from Proto-Mon-Khmer ʔaawʔ →Every word from Proto-Vietic ʔaːwʔ →Every word from Vietnamese áo →