An archaic or dialectal term, possibly referring to a ferret, a state of agitation, or a variant of 'fur'; exact definition uncertain.
Possibly from Old English 'fearr' (bull) or 'fer' (companion), or a diminutive related to 'ferret'; documentation is sparse and regional variation exists.
Ferr is a ghost word in English—it appears in old texts but its meaning is so unclear that modern dictionaries struggle to define it, making it a perfect example of how language loses words when they fall out of common use.
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