The Collaborative International Dictionary of English v.0.48:

Cirque \Cirque\, n. [F., fr. L. circus.]
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   1. A circle; a circus; a circular erection or arrangement of
      objects.
      [1913 Webster]

            A dismal cirque
            Of Druid stones upon a forlorn moor.  --Keats.
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   2. A kind of circular valley in the side of a mountain,
      walled around by precipices of great height.
      [1913 Webster]