Where does “fo-dhearg” come from?

fo-dhearg (Scottish Gaelic) comes from Scottish Gaelic fo, from Old Irish fo, from Proto-Celtic uɸo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

fo-dhearg (Scottish Gaelic): infrared

Definitions

  1. infrared

Ancestry of “fo-dhearg”, step by step

fo-dhearg traces back through two separate lines of ancestry.

via Scottish Gaelic fo

StepLanguageWordMeaning
1Scottish Gaelicfounder, below, beneath; under the influence of
2Old Irishfounder, beneath; towards; through, throughout
3Proto-Celticuɸounder, below
4Proto-Indo-Europeanupóunder, below
5Proto-Indo-Europeanh₃ewp-—

via Scottish Gaelic dearg

StepLanguageWordMeaning
1Scottish Gaelicdeargred; reddish; complete, utter
2Old Irishdergred
3Proto-Celticdergosred crimson
4Proto-Indo-Europeandʰerg-to dim, darken; dim, dull; dark, dusky
5Proto-Indo-Europeandʰer-to support; to hold
Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Celtic uɸo →