Definitions:

1. A bag or container filled with ice or a cold substance used to apply cold therapy to injuries or for cooling purposes. NOUN
   • She applied an ice pack to her sprained ankle to reduce swelling.
2. A large area of sea ice that is compacted and floats on the ocean's surface. NOUN
   • The ship had to navigate carefully through the ice pack in the Arctic.

Synonyms:

• berg ice
• cold compress
• cold pack
• ice bag
• ice floe
• ice sheet
• pack ice