Where does “istid” come from?

istid (Norwegian Bokmål) comes from Norwegian Bokmål tid, from Old Norse tíð, from Proto-Germanic tīdiz, from Proto-Indo-European déh₂itis, from Proto-Indo-European deh₂y-, from Proto-Indo-European deh₂- — to share, divide.

istid (Norwegian Bokmål): ice age

Definitions

  1. ice age

Ancestry of “istid”, step by step

istid traces back through two separate lines of ancestry.

via Norwegian Bokmål tid

StepLanguageWordMeaning
1Norwegian Bokmåltidtime; an age or era
2Old Norsetíðtime; hour; divine service, prayers
3Proto-Germanictīdiztime; period, interval
4Proto-Indo-Europeandéh₂itisinterval, period of time
5Proto-Indo-Europeandeh₂y-to share, divide
6Proto-Indo-Europeandeh₂-to share, divide

via Norwegian Bokmål is

StepLanguageWordMeaning
1Norwegian Bokmålisice, ice cream; ice cream on a stick or cone
2Old Norseíssice
3Proto-Germanicīsąice
4Proto-Indo-Europeanh₁eyH-ice, frost
Every word from Proto-Indo-European deh₂- →Every word from Proto-Indo-European deh₂y- →Every word from Proto-Indo-European déh₂itis →