[voorm, woorm, wurm; German vyrm]
the fourth stage of the glaciation of Eurasia during the Pleistocene. Compare Wisconsin ( def 3 ).

< German (1909), after a river in Bavaria, joining the Starnberger See and the river Amper

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Würm (vʊəm, wɜːm)
Günz Riss See also Mindel the fourth and final Pleistocene glaciation in Alpine Europe
[C20: named after the river Würm in Bavaria, Germany]

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