Norwegian Nynorsk sur

← Danish sur (cognate)

← German sauer (cognate)

← English sour (cognate)

← Proto-Germanic *sūraz (derived)

← Proto-Indo-European *súHros (derived)

← Icelandic súr (cognate)

← Dutch zuur (cognate)

← Old Norse súrr (derived)

→ Norwegian Nynorsk surdeig (affix)