The term 'brown or white weasel' can be summarized by the crossword solution 'ERMINE'. ERMINE is a species of small mammal in the genus Mustela, which includes weasels, ferrets, and minks. It is known for its white winter coat with black-tipped tail, although some individuals may have a brown coat in the summer. ERMINE are found throughout the Northern Hemisphere, and are especially common in northern Europe and Asia.