Definitions:

1. A section of a glacier that moves over a steep slope or cliff, causing the ice to crack, fracture, and form towering ice blocks, resembling a frozen waterfall. NOUN
   • The sound of the icefall's constant rumbling served as and eerie reminder of the dangers lurking nearby.
2. Refers to a steep, frozen cascade of ice, similar to a waterfall, but made of glacial ice that flows and breaks as it moves over uneven terrain. NOUN
   • Massive icefall fragments plunged down the mountain, leaving a trail of destruction in their wake.

Synonyms:

• frozen waterfall
• glacier cascade
• serac zone