Where does “dru-kó” come from?

dru-kó (Proto-Indo-European) comes from Proto-Indo-European dóru, from Proto-Indo-European drew- — hard, firm, strong, solid; hard, fast; tree.

Ancestry of “dru-kó”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeandórutree
2Proto-Indo-Europeandrew-hard, firm, strong, solid; hard, fast; tree
Every word from Proto-Indo-European drew- →Every word from Proto-Indo-European dóru →