glacier

noun3

1. •
   A large body of ice which flows under its own mass, usually downhill.

   • They warned that the effects of glacier melting on water resources are becoming “increasingly serious” for China.
2. •
   An area of a mountain where snow is present year-round.

   • You can ski down the glacier in both the winter and the summer.
3. •
   (figurative) Something that moves very slowly

   • The queue in the pharmacy was a glacier.