noun[usually as modifier] Geology
1The penultimate Pleistocene glaciation in the Alps, possibly corresponding to the Saale of northern Europe.
More example sentences
- Gunz, Mindel, Riss and Wurm are the names of four ice ages.
early 20th century: from the name of a tributary of the Danube River in Germany.
Definition of Riss in:
- The British & World English dictionary