Where does “firth” come from?

firth (English) comes from Middle English firth, from Scots firth, from Middle English fyrth, from Old Norse fjǫrðr, from Proto-Norse ᚠᛖᚱᚦᚢᛉ, from Proto-Germanic ferþuz, from Proto-Indo-European pértus, from Proto-Indo-European per- — passed , crossed.

firth (English): An arm or inlet of the sea; a river estuary;...

Definitions

  1. An arm or inlet of the sea; a river estuary;...

Ancestry of “firth”, step by step

StepLanguageWordMeaning
1Middle EnglishfirthAlternative form of frith; forest, game preserve
2Scotsfirth
3Middle Englishfyrth
4Old Norsefjǫrðrfirth, fjord
5Proto-Norseᚠᛖᚱᚦᚢᛉ
6Proto-Germanicferþuzinlet, fjord
7Proto-Indo-Europeanpértuscrossing
8Proto-Indo-Europeanper-before, in front; first; to go through
9Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Proto-Indo-European pr̥tósEvery word from Proto-Indo-European per-Every word from Proto-Indo-European pértus