moulin
/muːˈlæn/
noun
- A vertical or nearly vertical shaft in a glacier, formed by meltwater carving a hole through the ice.
- The sound of rushing water echoed from the depths of the moulin.
- Glaciologists lowered a camera into the moulin to study the water flow beneath the glacier.
- The hikers carefully avoided the moulin, which could be hidden by a thin layer of snow.