oruliustiku kulutusvorm, an amphitheatre-like incision which is open on the downhill side on the slope of a mountain formed by head-wall erosion by the valley glacier at the snowline. The floor of the cirque is most often overdeepened below the level of the cirque's low-side outlet. If the cirque is subject to seasonal melting or a snowline rises, the floor of the cirque most often holds a small body of water called - tarn lake.