Etymology
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stoat (n.)

mid-15c., stote, "the ermine, especially in its brown summer coat," of uncertain origin. The word bears resemblance to Old Norse stutr "bull," Swedish stut "bull," Danish stud "ox," but the sense is difficult unless a common notion is "male animal."

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Definitions of stoat

stoat (n.)
the ermine in its brown summer coat with black-tipped tail;
From wordnet.princeton.edu