Ermine/ˈɜːrmɪn/ Definition 1 of 3Pro Tip 1/2Seasonal Fur Emphasizes ermine's winter appearance, which differs from summer when it's brown. In winter, the ermine's fur turns snowy white. Pro Tip 2/2Camouflage White fur provides ermines with camouflage against snow for hunting. The ermine's white fur blends with the snowy landscape.