Where does “dubrum” come from?

dubrum (Gaulish) comes from Proto-Celtic dubros, from Proto-Indo-European dʰubʰrós, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “dubrum”, step by step

StepLanguageWordMeaning
1Proto-Celticdubrosdark; water
2Proto-Indo-Europeandʰubʰrósdeep
3Proto-Indo-Europeandʰewbʰ-deep
4Proto-Indo-Europeandʰewh₂-smoke; mist, haze

Words derived from “dubrum

Every word from Proto-Indo-European dʰewh₂-Every word from Proto-Indo-European dʰewbʰ-Every word from Proto-Indo-European dʰubʰrós