from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A nearly vertical shaft or cavity worn in a glacier by surface or rock debris falling through a crack in the ice.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A cylindrical, vertical shaft that extends through a glacier and is carved by meltwater from the glacier’s surface.
from The Century Dictionary and Cyclopedia
- n. A nearly vertical shaft or cavity worn in a glacier by the running down of water, which sometimes in the hot days of summer, on the large glaciers, forms considerable rivulets on the surface of the ice.
French, mill, moulin, from Old French molin, mill, from Late Latin molīnum; see mill1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From French moulin, from Late Latin molinum ("mill"). (Wiktionary)