Definition of Riss in English:

Riss

noun

usually as modifier
  • 1Geology
    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. 1.1The 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/