(1) A semicircular basin in an alpine landscape resulting from glaciation.
Progressive expansion of neighboring cirques results in the erosion of the unglaciated slopes between them to sharp, knife-edged ridges or aretes.
(2) Cirques are formed by glaciers eroding a mountain, plucking rocks from the sides and back as the glacier moves.
(3) The steep-walled bowl carved by glacial action at the head of a side canyon.
(1) In Welsh, it's "Cwm", but it's still a cirque. Cirques are fun, and sort of circular, which keeps you from running off in all directions at once.
(2) We stopped for lunch in the cirque and admired the view. Then the famished mice got us.