Unna's boot
noun
Un·na's boot
variants:
or Unna boot \ ˈü-nə(z)- 
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Medical Definition of Unna's boot
: a compression dressing for varicose veins or ulcers consisting of a paste made of zinc oxide, gelatin, glycerin, and water that is applied to the lower leg, covered with a bandage, and then applied to the outside of the bandage