An archaic, dialect, or alternative spelling of 'further,' meaning at or to a greater distance, or to a greater degree or extent.
From Old English furðor, an archaic form of further. The 'ferther' spelling appears in older texts and regional dialects before standardization settled on 'further.'
Medieval spelling was wildly inconsistent—writers would spell the same word multiple ways in a single document, so 'ferther' isn't a mistake but shows language in transition before dictionaries standardized everything.
Complete word intelligence in one call. Free tier — 50 lookups/day.