Muschelkalk Syllabification: (Mu·schel·kalk)Pronunciation: /ˈmo͝oSHəlˌkälk/Definition of Muschelkalk noun Geology a limestone or chalk deposit from the Middle Triassic in Europe, especially in Germany. Origin: mid 19th century: from German, literally 'mussel chalk'Muschelkalk in other Oxford dictionaries Definition of Muschelkalk in the British & World English dictionary