Where does “Jahrhunderthochwasser” come from?

Jahrhunderthochwasser (German) comes from German Jahrhundert, from German Hundert, from Middle High German hundert, from Old Saxon hunderod, from Proto-West Germanic *hundarad, from Proto-Germanic hundaradą, from Proto-Germanic hundą, from Proto-Indo-European ḱm̥tóm — ten.

Ancestry of “Jahrhunderthochwasser”, step by step

Jahrhunderthochwasser traces back through two separate lines of ancestry.

via German Jahrhundert

StepLanguageWordMeaning
1GermanJahrhundertA century
2GermanHundertthe number 100; A unity of hundred things
3Middle High Germanhundert
4Old Saxonhunderodhundred
5Proto-West Germanic*hundaradhundred
6Proto-Germanichundaradąa great hundred; a hundred
7Proto-Germanichundąa great hundred; a hundred
8Proto-Indo-Europeanḱm̥tómhundred
9Proto-Indo-Europeandéḱm̥ten

via German Hochwasser

StepLanguageWordMeaning
1GermanHochwassera very high water level in any body of water;...
2Germanwasserinflection of wassern: ## first-person singular...
3Middle High Germanwazzerwater
4Old High Germanwaȥȥarwater
5Proto-West Germanicwatarwater
6Proto-Germanicwatōrwater
7Proto-Indo-Europeanwódr̥water
8Proto-Indo-Europeanwed-water
9Proto-Indo-Europeanwey-to wither; fade; to move, go ahead; to be strong;...
Every word from Proto-Indo-European déḱm̥Every word from Proto-Indo-European ḱm̥tómEvery word from Proto-Germanic hundą