Proto-IE: *wrā̆g'h-
Meaning: prick, needle, pricky branch
Old Greek: rhǟkhó-s f. `Dornstrauch, Dornhecke, dorniges( Reis); Bergrucken'; rhákhi-s, -ios, att. -eōs f. `Rückgrat, Berggrat'
Celtic: MIr fracc `Nadel'
Russ. meaning: колючка, иголка, ветка с колючками