English
least weasel
From least + weasel, from the fact that it is the smallest member of its genus.
Today it means
noun The common weasel, little weasel, or simply weasel (Mustela nivalis), the smallest member of the weasel genus Mustela, native to Eurasia, North America, and North Africa.
Language periods are conventional ranges, not dates for this word.
Etymograph / least weasel