An Etymological Dictionary of the German Language/Schelle
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Schelle, f., ‘small bell,’ from the equiv. MidHG. schëlle, OHG. schëlla, f.; allied to MidHG. schëllen, OHG. scëllan, ‘to sound loudly, resound,’ to which Ital. squilla, ‘little bell,’ is also akin. — ModHG. and MidHG. schellen, lit. ‘to cause to resound,’ is the factitive form. Comp. verschollen, ‘vanished,’ as a relic of the MidHG. str. verb.