glacier
/ˈɡleɪ.ʃɚ/noun
A huge mass of ice that moves slowly downhill under its own weight.
Example sentences
- “The hikers could see a glacier stretching down between the peaks.”
- “Many glaciers in the Alps are shrinking as the climate warms.”
The adjective 'glacial' does double duty: glacial landscapes, but also glacial pace or a glacial stare, meaning extremely slow or icily hostile.