From The Collaborative International Dictionary of English v.0.48:
Cirque \Cirque\, n. [F., fr. L. circus.]
[1913 Webster]
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.
[1913 Webster]
2. A kind of circular valley in the side of a mountain,
walled around by precipices of great height.
[1913 Webster]