An Etymological Dictionary of the German Language/Ampel
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Ampel, f., ‘lamp,’ from MidHG. ampel (also ampulle), OHG. ampulla, f., ‘lamp,’ also ‘vessel.’ Borrowed in OHG. from Lat. ampulla, ‘flask, vessel,’ whence also AS. ampelle, OIc. ample, ‘vessel’ (LG. pulle, ‘bottle’).