stoat (n.)youdaoicibaDictYouDict[stoat 词源字典]
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."[stoat etymology, stoat origin, 英语词源]