Where does “genualis” come from?

genualis (Latin) comes from Latin genu, from Proto-Italic genū, from Proto-Indo-European ǵónu — knee.

Ancestry of “genualis”, step by step

StepLanguageWordMeaning
1Latingenuknee; elbow
2Proto-Italicgenū—
3Proto-Indo-Europeanǵónuknee
Every word from Proto-Indo-European ǵónu →Every word from Proto-Italic genū →Every word from Latin genu →