←
Proto-Germanic *-iskaz (inherited)
←
Proto-Indo-European *h₃er- (root)
←
Proto-Indo-European *h₂epó (derived)
←
Proto-Indo-European *h₃er- (derived)
←
Proto-Indo-European *-iskos (inherited)
←
Proto-Italic *ab (derived)
←
Proto-Italic *orjōr (derived)
←
Norwegian Bokmål sk (suffix)
←
Old Norse -iskr (inherited)
←
Old Norse -skr (mention)