Definition of Riss in English:

Riss

noun

Geology
  • 1[usually as modifier] The penultimate Pleistocene glaciation in the Alps, possibly corresponding to the Saale of northern Europe.

    • ‘Gunz, Mindel, Riss and Wurm are the names of four ice ages.’
    1. 1.1 The system of deposits laid down during the Riss glaciation.

Origin

Early 20th century: from the name of a tributary of the River Danube in Germany.

Pronunciation:

Riss

/rɪs/