a chute through which supraglacial water enters a glacier, boring either to the bedrock or to the depth of common crevasse formation
"the icy river plunged, roaring, into the moulin's blue depths"
A cylindrical, vertical shaft that extends through a glacier and is carved by meltwater from the glacier’s surface.
"The guide explained how the hidden moulin acts as a direct highway for water to travel deep beneath the ice before draining into subglacial rivers."