An Etymological Dictionary of the German Language/Schellkraut
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Schellkraut, n., ‘swallow-wort, celandine,’ from MidHG. shëlkrut, -wurz; probably an abbreviation and corruption of the equiv. MidLat. chelidonia (ch pronounced as in the corresponding Fr. chélidoine); comp. Gr. χελιδόνιον, ‘celandine.’