An Etymological Dictionary of the German Language/Annotated/Wirbel
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Wirbel, masculine, ‘whirl, vortex, whirlpool, bustle, crown (of the head),’ from Middle High German wirbel, masculine, ‘vortex, crown (of the head), whirl,’ Old High German wirbil, wirfil, masculine, ‘whirlwind’; compare Old Icelandic hvirfell, ‘vortex, English whirl. Derivatives of the Teutonic root hwerb (hwerf), ‘to turn’ (see werben). With regard to Ropfwirbel note the evolution of meaning in Scheitel.