Definition of ermine
1 or plural ermine
a : any of several weasels whose coats become white in winter usually with black on the tip of the tail especially : a weasel (Mustela erminea) chiefly of northern Eurasia and North America that has a short tail, is found in varied habitats (such as forest, grassland, and tundra), and preys especially on small mammals (such as voles and mice) : short-tailed weasel, stoat
b : the white fur of the ermine
2 : a rank or office whose ceremonial or official robe is ornamented with ermine
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