1) German surname 2) Glacial landform 
[glacial] A riegel is a German term that describes traverse ridges of bedrock that have been exposed by glacial erosion. They are also known as rock bars, thresholds, and verrous. They are found in glaciated valleys, and are often associated with waterfalls and zones of rapids when streams are present. When multiple riegels are stacked in a...
Type: Term Pronunciation: rē′gĕl Definitions: 1. Franz, German physician, 1843-1904. See: Riegel pulse