Meaning of RISS in English

I. ˈris noun

( -es )

Usage: usually capitalized

Etymology: from the Riss river, tributary of the Danube in southwestern Germany

: the third stage of Pleistocene glaciation in Europe

II. adjective

or riss·ian -sēən

Usage: usually capitalized

: of or relating to the Riss glaciation

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.