moulin; vertical shaft in a glacier
A glaciology term for a roughly vertical hole or shaft in a glacier through which meltwater can drain.
A large moulin has opened on the surface of the glacier.
Meltwater flows through the moulin down to the bottom of the glacier.
Only the katakana form ムーラン and the gloss 'moulin'; no language-of-origin information is available, so the precise borrowing history is not specified here.