Würm

[voo rm, woo rm, wurm; German vyrm] /vʊərm, wʊərm, wɜrm; German vürm/
noun
1.
the fourth stage of the glaciation of Eurasia during the Pleistocene.
Compare Wisconsin (def 3).
Origin
< German (1909), after a river in Bavaria, joining the Starnberger See and the river Amper
British Dictionary definitions for Würm

Würm

/vʊəm; wɜːm/
noun
1.
the fourth and final Pleistocene glaciation in Alpine Europe See also Günz, Riss, Mindel
Word Origin
C20: named after the river Würm in Bavaria, Germany