stoat
Mustela erminea, the ermine or short-tailed weasel, a mustelid native to Eurasia and North America, distinguished from the least weasel by its larger size and longer tail with a prominent black tip.
Word history
From Middle English "stote" (the ermine, especially in its brown summer coat).
Where this comes from
This definition is adapted from “stoat” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.