An Etymological Dictionary of the German Language/Annotated/schrill
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schrill, adjective, ‘shrill,’ Modern High German only, formed from the equivalent Low German schrell; compare Middle English schrillen, English to shrill, Anglo-Saxon scralletan, ‘to sound loudly,’ Scandinavian skrölta, ‘to sound loudly.’ Teutonic and Aryan root skrel, skral.