Where does “halvtredser” come from?
halvtredser (Danish) comes from Danish halvtreds, from Danish halvtredsindstyve, from Danish halvtredje, from Norwegian Bokmål tredje, from Old Norse þriði, from Proto-Germanic þridjô, from Proto-Indo-European tretyós, from Proto-Indo-European tr̥tyós — three.
halvtredser (Danish): fifty
Ancestry of “halvtredser”, step by step