köken: Etymology tree Proto-Indo-European *deh₂-der. Proto-Indo-European *deh₂y- Proto-Indo-European *-tis Proto-Indo-European *déh₂itis Proto-Germanic *tīdiz Old Norse tíð Old Danish tith Danish tid Inherited from Old Danish tith, from Old Norse tíð, from Proto-Germanic *tīdiz, from Proto-Indo-European *déh₂itis, from *deh₂y- + *-tis.