Where does “Frwdwr” come from?

Frwdwr (Middle Welsh) comes from Middle Welsh dwr, from Proto-Celtic dubros, from Proto-Indo-European dʰubʰrós, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “Frwdwr”, step by step

StepLanguageWordMeaning
1Middle Welshdwrwater
2Proto-Celticdubrosdark; water
3Proto-Indo-Europeandʰubʰrósdeep
4Proto-Indo-Europeandʰewbʰ-deep
5Proto-Indo-Europeandʰewh₂-smoke; mist, haze
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Indo-European dʰewbʰ- →Every word from Proto-Indo-European dʰubʰrós →