Where does “cluster-wise” come from?

cluster-wise (English) comes from English cluster, from Middle English cluster, from Old English cluster, from Proto-Germanic klus-.

Ancestry of “cluster-wise”, step by step

StepLanguageWordMeaning
1EnglishclusterA group or bunch of several discrete items that...
2Middle Englishcluster—
3Old Englishcluster—
4Proto-Germanicklus-—
Every word from Proto-Germanic klus- →