glacier -
A large body of ice which flows under its own mass, usually downhill.
Wikipedia
A glacier is a large persistent body of ice. Originating on land, a glacier flows slowly due to stresses induced by its weight. The crevasses and other distinguishing features of a glacier are due to its flow.
OmegaWiki Dictionary
Ω
glacier Slow moving masses of ice which have accumulated either on mountains or in polar regions.