Where does “รถไฟใต้ดิน” come from?

รถไฟใต้ดิน (Thai) comes from Thai ใต้ดิน, from Thai ใต้, from Thai ฝ่า, from Thai ละออง, from Thai ธุลี, from Sanskrit धूलि, from Proto-Indo-Aryan dʰuHliṣ, from Proto-Indo-Iranian dʰuHliš — smoke; mist, haze.

รถไฟใต้ดิน (Thai): subway, metro, underground railway

Definitions

  1. subway, metro, underground railway

Ancestry of “รถไฟใต้ดิน”, step by step

รถไฟใต้ดิน traces back through two separate lines of ancestry.

via Thai ใต้ดิน

StepLanguageWordMeaning
1Thaiใต้ดินunderground; subterranean; concealed; illegal
2Thaiใต้south; south; southern; southward; inferior;...
3Thaiฝ่าpalm of the hand; sole of the foot; to go...
4Thaiละอองfine particles; dust; powder
5Thaiธุลีdust
6Sanskritधूलिdust, powder, pollen
7Proto-Indo-AryandʰuHliṣ
8Proto-Indo-IraniandʰuHliš
9Proto-Indo-Europeandʰuh₂lis
10Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via Thai รถไฟ

StepLanguageWordMeaning
1Thaiรถไฟtrain: connected group of rolling stock
2Thaiรถchariot, carriage, cart, wagon, or the like;...
3Palirathaa chariot, a car; delight, pleasure
4Sanskritरथchariot, car, especially a two-wheeled...
5Proto-Indo-IranianHrátʰaschariot
6Proto-Indo-EuropeanHrót-h₂-os
7Proto-Indo-EuropeanHret-to roll; wheel; to run, roll
Every word from Proto-Indo-European dʰewh₂-Every word from Proto-Indo-European dʰuh₂lisEvery word from Proto-Indo-Iranian dʰuHliš