Where does “eruca” come from?

eruca (Old Occitan) comes from Latin eruca, from Proto-Indo-European ǵʰer(s)-uk-eh₂, from Proto-Indo-European ǵʰers- — stiff; surprised.

Ancestry of “eruca”, step by step

StepLanguageWordMeaning
1Latinerucacaterpillar; colewort, rocket
2Proto-Indo-Europeanǵʰer(s)-uk-eh₂—
3Proto-Indo-Europeanǵʰers-stiff; surprised
Every word from Proto-Indo-European ǵʰers- →Every word from Proto-Indo-European ǵʰer(s)-uk-eh₂ →Every word from Latin eruca →