An Etymological Dictionary of the German Language/Ampel
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’).