From the equivalent Middle High German ampfer, Old High German ampfaro, masculine, allied to the equivalent Old English ompre; an adjective used as a substantive. Compare Dutch amper (“sharp, bitter, unripe”), Old Swedish amper, 'sour, bitter,' Old Norse apr (“sharp, chiefly of cold”) (for *ampr); also Low German ampern (“to prove bitter to the taste”). Sauerampfer (also corrupted to Sauer-ramf) is a tautological compound like Windhund. In case Proto-Germanic *ampra-, from Proto-Germanic *ambro-, represents the properly Proto-Indo-European *amró-, Sanskrit sour (amlá) (also 'wood-sorrel'), and Latin amârus (“bitter”), are primitively cognate with this word.
Ampfer m (genitive Ampfers, plural Ampfer)
- sorrel (plant)
- Ampfer in Duden online