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Definition of Ice pack
1. Noun. A waterproof bag filled with ice: applied to the body (especially the head) to cool or reduce swelling.
2. Noun. A large expanse of floating ice.
Medical Definition of Ice pack
1. A cold local application to limit or reduce swelling in recently traumatised tissues; usually in the form of a water-impervious container for ice. Improvised means for containing ice (plastic bags, towels, etc.) are often employed, as are chemical sacks that when struck allow the commingling of chemicals that react endothermically. (05 Mar 2000)