Where does “downcomer” come from?

downcomer (English) comes from English Down, from Middle English doun, from Old English dūn, from Proto-Germanic *dūnā, from Proto-Celtic dūnom, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

downcomer (English): A pipe to conduct something downwards

Definitions

  1. A pipe to conduct something downwards

Ancestry of “downcomer”, step by step

downcomer traces back through two separate lines of ancestry.

via English Down

StepLanguageWordMeaning
1EnglishDownusually known as County Down
2Middle Englishdoundown
3Old Englishdūnhill, down; hill, dune; hill, mountain
4Proto-Germanic*dūnā—
5Proto-Celticdūnomstronghold, rampart
6Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via English comer

StepLanguageWordMeaning
1EnglishcomerOne in a race who is catching up to others and...
2Middle Englishcomere—
Every word from Proto-Indo-European dʰewh₂- →