An Etymological Dictionary of the German Language/Annotated/Tropfen

by Friedrich Kluge

Tropfen, masculine, ‘drop, tear,’ from the equivalent Middle High German tropfe (troffe), Old High German tropfo (troffo), masculine; corresponding to Old Saxon dropo, Dutch drop, Anglo-Saxon dropa, English drop, and the equivalent Old Icelandic drope. A derivative of the Teutonic root drup (see triefen).