However, you can use:
* Visão (feminine): This is the most common way to refer to the mink in Portuguese, although it translates literally to "vision". It's used in the context of fur, as in "casaco de visão" (mink coat).
* Martim (masculine): This word is generally used for the "American mink", which is a type of weasel.
* Doninha (feminine): This means "weasel" and could be used to refer to a mink in general, but it's not as specific as "visão."
Ultimately, the best way to say "mink" in Brazilian Portuguese will depend on the context. If you're referring to the fur, "visão" is the most common and appropriate term.