Lady With an __, Leonardo Oil Painting in Krakow

Word Meaning:

ERMINE — A weasel found in northern latitudes (Mustela erminea in Eurasia, Alaska, and the Arctic, Mustela haidarum in Haida Gwaii, Mustela richardsonii in the rest of North America); its dark brown fur turns white in winter, apart from the black tip of the tail.

Definitions from Wiktionary.