ferret /ˈfɛɹɪt/noun 4verb 2forms 3phrases 2 noun4 •An often domesticated mammal (Mustela putorius furo) rather like a weasel, descended from the European polecat and often trained to hunt burrowing animals. •A black-footed ferret (Mustela nigripes). •(figurative) A diligent searcher. •(old-fashioned) A tape of silk, cotton, or ribbon, used to tie documents, clothing, etc. or along the edge of fabric. verb2 •To hunt game with ferrets. •To uncover and bring to light by searching; usually to ferret out.Master Fer! I'll fer him, and firk him, and ferret him. — 1599 formsferreted · ferreting · ferrets Phrases with ferret ferret aroundTo search for something by sorting through materials or (in the case of information) by speaking to contacts and following leads. ferret outTo discover something after searching.