Home › Words › F › fingerbreadthfingerbreadthfingerbreadth means A (usually approximate and informal) unit of measurement based upon the radial width of the human finger.EtymologyFrom finger + breadth. Compare Middle English fynger brede, fyngerbrede, fyngyrbrede.nounA (usually approximate and informal) unit of measurement based upon the radial width of the human finger.Definitions & examples from Wiktionary (CC BY-SA 3.0).